diff --git a/runtime/syntax/modula2.vim b/runtime/syntax/modula2.vim
index 4a14cf1..6a9f4af 100644
--- a/runtime/syntax/modula2.vim
+++ b/runtime/syntax/modula2.vim
@@ -1,73 +1,16 @@
 " Vim syntax file
-" Language:	Modula 2
-" Maintainer:	pf@artcom0.north.de (Peter Funk)
-"   based on original work of Bram Moolenaar <Bram@vim.org>
-" Last Change:	2001 May 09
+" Language:		Modula-2
+" Maintainer:		Doug Kearns <dougkearns@gmail.com>
+" Previous Maintainer:	pf@artcom0.north.de (Peter Funk)
+" Last Change:		2024 Jan 04
 
-" quit when a syntax file was already loaded
 if exists("b:current_syntax")
   finish
 endif
 
-" Don't ignore case (Modula-2 is case significant). This is the default in vim
-
-" Especially emphasize headers of procedures and modules:
-syn region modula2Header matchgroup=modula2Header start="PROCEDURE " end="(" contains=modula2Ident oneline
-syn region modula2Header matchgroup=modula2Header start="MODULE " end=";" contains=modula2Ident oneline
-syn region modula2Header matchgroup=modula2Header start="BEGIN (\*" end="\*)" contains=modula2Ident oneline
-syn region modula2Header matchgroup=modula2Header start="END " end=";" contains=modula2Ident oneline
-syn region modula2Keyword start="END" end=";" contains=ALLBUT,modula2Ident oneline
-
-" Some very important keywords which should be emphasized more than others:
-syn keyword modula2AttKeyword CONST EXIT HALT RETURN TYPE VAR
-" All other keywords in alphabetical order:
-syn keyword modula2Keyword AND ARRAY BY CASE DEFINITION DIV DO ELSE
-syn keyword modula2Keyword ELSIF EXPORT FOR FROM IF IMPLEMENTATION IMPORT
-syn keyword modula2Keyword IN LOOP MOD NOT OF OR POINTER QUALIFIED RECORD
-syn keyword modula2Keyword SET THEN TO UNTIL WHILE WITH
-
-syn keyword modula2Type ADDRESS BITSET BOOLEAN CARDINAL CHAR INTEGER REAL WORD
-syn keyword modula2StdFunc ABS CAP CHR DEC EXCL INC INCL ORD SIZE TSIZE VAL
-syn keyword modula2StdConst FALSE NIL TRUE
-" The following may be discussed, since NEW and DISPOSE are some kind of
-" special builtin macro functions:
-syn keyword modula2StdFunc NEW DISPOSE
-" The following types are added later on and may be missing from older
-" Modula-2 Compilers (they are at least missing from the original report
-" by N.Wirth from March 1980 ;-)  Highlighting should apply nevertheless:
-syn keyword modula2Type BYTE LONGCARD LONGINT LONGREAL PROC SHORTCARD SHORTINT
-" same note applies to min and max, which were also added later to m2:
-syn keyword modula2StdFunc MAX MIN
-" The underscore was originally disallowed in m2 ids, it was also added later:
-syn match   modula2Ident " [A-Z,a-z][A-Z,a-z,0-9,_]*" contained
-
-" Comments may be nested in Modula-2:
-syn region modula2Comment start="(\*" end="\*)" contains=modula2Comment,modula2Todo
-syn keyword modula2Todo	contained TODO FIXME XXX
-
-" Strings
-syn region modula2String start=+"+ end=+"+
-syn region modula2String start="'" end="'"
-syn region modula2Set start="{" end="}"
-
-" Define the default highlighting.
-" Only when an item doesn't have highlighting yet
-
-hi def link modula2Ident		Identifier
-hi def link modula2StdConst	Boolean
-hi def link modula2Type		Identifier
-hi def link modula2StdFunc		Identifier
-hi def link modula2Header		Type
-hi def link modula2Keyword		Statement
-hi def link modula2AttKeyword	PreProc
-hi def link modula2Comment		Comment
-" The following is just a matter of taste (you want to try this instead):
-" hi modula2Comment term=bold ctermfg=DarkBlue guifg=Blue gui=bold
-hi def link modula2Todo		Todo
-hi def link modula2String		String
-hi def link modula2Set		String
-
+let dialect = modula2#GetDialect()
+exe "runtime! syntax/modula2/opt/" .. dialect .. ".vim"
 
 let b:current_syntax = "modula2"
 
-" vim: ts=8
+" vim: nowrap sw=2 sts=2 ts=8 noet:
diff --git a/runtime/syntax/modula2/opt/iso.vim b/runtime/syntax/modula2/opt/iso.vim
new file mode 100644
index 0000000..5bd24f6
--- /dev/null
+++ b/runtime/syntax/modula2/opt/iso.vim
@@ -0,0 +1,380 @@
+" Vim syntax file
+" Language:    Modula-2 (ISO)
+" Maintainer:  B.Kowarsch <trijezdci@moc.liamg>
+" Last Change: 2016 August 22
+
+" ----------------------------------------------------
+" THIS FILE IS LICENSED UNDER THE VIM LICENSE
+" see https://github.com/vim/vim/blob/master/LICENSE
+" ----------------------------------------------------
+
+" Remarks:
+" Vim Syntax files are available for the following Modula-2 dialects:
+" * for the PIM dialect : m2pim.vim
+" * for the ISO dialect : m2iso.vim (this file)
+" * for the R10 dialect : m2r10.vim
+
+" -----------------------------------------------------------------------------
+" This syntax description follows ISO standard IS-10514 (aka ISO Modula-2)
+" with the addition of the following language extensions:
+" * non-standard types LONGCARD and LONGBITSET
+" * non-nesting code disabling tags ?< and >? at the start of a line
+" -----------------------------------------------------------------------------
+
+" Parameters:
+"
+" Vim's filetype script recognises Modula-2 dialect tags within the first 200
+" lines of Modula-2 .def and .mod input files.  The script sets filetype and
+" dialect automatically when a valid dialect tag is found in the input file.
+" The dialect tag for the ISO dialect is (*!m2iso*).  It is recommended to put
+" the tag immediately after the module header in the Modula-2 input file.
+"
+" Example:
+"  DEFINITION MODULE Foolib; (*!m2iso*)
+"
+" Variable g:modula2_default_dialect sets the default Modula-2 dialect when the
+" dialect cannot be determined from the contents of the Modula-2 input file:
+" if defined and set to 'm2iso', the default dialect is ISO.
+"
+" Variable g:modula2_iso_allow_lowline controls support for lowline in identifiers:
+" if defined and set to a non-zero value, they are recognised, otherwise not
+"
+" Variable g:modula2_iso_disallow_octals controls the rendering of octal literals:
+" if defined and set to a non-zero value, they are rendered as errors.
+"
+" Variable g:modula2_iso_disallow_synonyms controls the rendering of @, & and ~:
+" if defined and set to a non-zero value, they are rendered as errors.
+"
+" Variables may be defined in Vim startup file .vimrc
+"
+" Examples:
+"  let g:modula2_default_dialect = 'm2iso'
+"  let g:modula2_iso_allow_lowline = 1
+"  let g:modula2_iso_disallow_octals = 1
+"  let g:modula2_iso_disallow_synonyms = 1
+
+
+if exists("b:current_syntax")
+  finish
+endif
+
+" Modula-2 is case sensitive
+syn case match
+
+
+" -----------------------------------------------------------------------------
+" Reserved Words
+" -----------------------------------------------------------------------------
+syn keyword modula2Resword AND ARRAY BEGIN BY CASE CONST DEFINITION DIV DO ELSE
+syn keyword modula2Resword ELSIF EXCEPT EXIT EXPORT FINALLY FOR FORWARD FROM IF
+syn keyword modula2Resword IMPLEMENTATION IMPORT IN LOOP MOD NOT OF OR PACKEDSET
+syn keyword modula2Resword POINTER QUALIFIED RECORD REPEAT REM RETRY RETURN SET
+syn keyword modula2Resword THEN TO TYPE UNTIL VAR WHILE WITH
+
+
+" -----------------------------------------------------------------------------
+" Builtin Constant Identifiers
+" -----------------------------------------------------------------------------
+syn keyword modula2ConstIdent FALSE NIL TRUE INTERRUPTIBLE UNINTERRUPTIBLE
+
+
+" -----------------------------------------------------------------------------
+" Builtin Type Identifiers
+" -----------------------------------------------------------------------------
+syn keyword modula2TypeIdent BITSET BOOLEAN CHAR PROC
+syn keyword modula2TypeIdent CARDINAL INTEGER LONGINT REAL LONGREAL
+syn keyword modula2TypeIdent COMPLEX LONGCOMPLEX PROTECTION
+
+
+" -----------------------------------------------------------------------------
+" Builtin Procedure and Function Identifiers
+" -----------------------------------------------------------------------------
+syn keyword modula2ProcIdent CAP DEC EXCL HALT INC INCL
+syn keyword modula2FuncIdent ABS CHR CMPLX FLOAT HIGH IM INT LENGTH LFLOAT MAX MIN
+syn keyword modula2FuncIdent ODD ORD RE SIZE TRUNC VAL
+
+
+" -----------------------------------------------------------------------------
+" Wirthian Macro Identifiers
+" -----------------------------------------------------------------------------
+syn keyword modula2MacroIdent NEW DISPOSE
+
+
+" -----------------------------------------------------------------------------
+" Unsafe Facilities via Pseudo-Module SYSTEM
+" -----------------------------------------------------------------------------
+syn keyword modula2UnsafeIdent ADDRESS BYTE LOC WORD
+syn keyword modula2UnsafeIdent ADR CAST TSIZE SYSTEM
+syn keyword modula2UnsafeIdent MAKEADR ADDADR SUBADR DIFADR ROTATE SHIFT
+
+
+" -----------------------------------------------------------------------------
+" Non-Portable Language Extensions
+" -----------------------------------------------------------------------------
+syn keyword modula2NonPortableIdent LONGCARD LONGBITSET
+
+
+" -----------------------------------------------------------------------------
+" User Defined Identifiers
+" -----------------------------------------------------------------------------
+syn match modula2Ident "[a-zA-Z][a-zA-Z0-9]*\(_\)\@!"
+syn match modula2LowLineIdent "[a-zA-Z][a-zA-Z0-9]*\(_[a-zA-Z0-9]\+\)\+"
+
+
+" -----------------------------------------------------------------------------
+" String Literals
+" -----------------------------------------------------------------------------
+syn region modula2String start=/"/ end=/"/ oneline
+syn region modula2String start=/'/ end=/'/ oneline
+
+
+" -----------------------------------------------------------------------------
+" Numeric Literals
+" -----------------------------------------------------------------------------
+syn match modula2Num
+  \ "\(\([0-7]\+\)[BC]\@!\|[89]\)[0-9]*\(\.[0-9]\+\([eE][+-]\?[0-9]\+\)\?\)\?"
+syn match modula2Num "[0-9A-F]\+H"
+syn match modula2Octal "[0-7]\+[BC]"
+
+
+" -----------------------------------------------------------------------------
+" Punctuation
+" -----------------------------------------------------------------------------
+syn match modula2Punctuation
+  \ "\.\|[,:;]\|\*\|[/+-]\|\#\|[=<>]\|\^\|\[\|\]\|(\(\*\)\@!\|[){}]"
+syn match modula2Synonym "[@&~]"
+
+
+" -----------------------------------------------------------------------------
+" Pragmas
+" -----------------------------------------------------------------------------
+syn region modula2Pragma start="<\*" end="\*>"
+syn match modula2DialectTag "(\*!m2iso\(+[a-z0-9]\+\)\?\*)"
+
+" -----------------------------------------------------------------------------
+" Block Comments
+" -----------------------------------------------------------------------------
+syn region modula2Comment start="(\*\(!m2iso\(+[a-z0-9]\+\)\?\*)\)\@!" end="\*)"
+  \ contains = modula2Comment, modula2CommentKey, modula2TechDebtMarker
+syn match modula2CommentKey "[Aa]uthor[s]\?\|[Cc]opyright\|[Ll]icense\|[Ss]ynopsis"
+syn match modula2CommentKey "\([Pp]re\|[Pp]ost\|[Ee]rror\)\-condition[s]\?:"
+
+
+" -----------------------------------------------------------------------------
+" Technical Debt Markers
+" -----------------------------------------------------------------------------
+syn keyword modula2TechDebtMarker contained DEPRECATED FIXME
+syn match modula2TechDebtMarker "TODO[:]\?" contained
+
+" -----------------------------------------------------------------------------
+" Disabled Code Sections
+" -----------------------------------------------------------------------------
+syn region modula2DisabledCode start="^?<" end="^>?"
+
+
+" -----------------------------------------------------------------------------
+" Headers
+" -----------------------------------------------------------------------------
+" !!! this section must be second last !!!
+
+" new module header
+syn match modula2ModuleHeader
+  \ "MODULE\( [A-Z][a-zA-Z0-9]*\)\?"
+  \ contains = modula2ReswordModule, modula2ModuleIdent
+
+syn match modula2ModuleIdent
+  \ "[A-Z][a-zA-Z0-9]*" contained
+
+syn match modula2ModuleTail
+  \ "END [A-Z][a-zA-Z0-9]*\.$"
+  \ contains = modula2ReswordEnd, modula2ModuleIdent, modula2Punctuation
+
+" new procedure header
+syn match modula2ProcedureHeader
+  \ "PROCEDURE\( [a-zA-Z][a-zA-Z0-9]*\(_[a-zA-Z0-9]\+\)*\)\?"
+  \ contains = modula2ReswordProcedure,
+  \ modula2ProcedureIdent, modula2ProcedureLowlineIdent, modula2IllegalChar, modula2IllegalIdent
+
+syn match modula2ProcedureIdent
+  \ "\([a-zA-Z]\)\([a-zA-Z0-9]*\)" contained
+
+syn match modula2ProcedureLowlineIdent
+  \ "[a-zA-Z][a-zA-Z0-9]*\(_[a-zA-Z0-9]\+\)\+" contained
+
+syn match modula2ProcedureTail
+  \ "END\( \([a-zA-Z][a-zA-Z0-9]*\(_[a-zA-Z0-9]\+\)*\)[.;]$\)\?"
+  \ contains = modula2ReswordEnd,
+  \ modula2ProcedureIdent, modula2ProcedureLowLineIdent,
+  \ modula2Punctuation, modula2IllegalChar, modula2IllegalIdent
+
+syn keyword modula2ReswordModule contained MODULE
+syn keyword modula2ReswordProcedure contained PROCEDURE
+syn keyword modula2ReswordEnd contained END
+
+
+" -----------------------------------------------------------------------------
+" Illegal Symbols
+" -----------------------------------------------------------------------------
+" !!! this section must be last !!!
+
+" any '`' '!' '$' '%' or '\'
+syn match modula2IllegalChar "[`!$%\\]"
+
+" any solitary sequence of '_'
+syn match modula2IllegalChar "\<_\+\>"
+
+" any '?' at start of line if not followed by '<'
+syn match modula2IllegalChar "^?\(<\)\@!"
+
+" any '?' not following '>' at start of line
+syn match modula2IllegalChar "\(\(^>\)\|\(^\)\)\@<!?"
+
+" any identifiers with leading occurrences of '_'
+syn match modula2IllegalIdent "_\+[a-zA-Z][a-zA-Z0-9]*\(_\+[a-zA-Z0-9]*\)*"
+
+" any identifiers containing consecutive occurences of '_'
+syn match modula2IllegalIdent
+  \ "[a-zA-Z][a-zA-Z0-9]*\(_[a-zA-Z0-9]\+\)*\(__\+[a-zA-Z0-9]\+\(_[a-zA-Z0-9]\+\)*\)\+"
+
+" any identifiers with trailing occurrences of '_'
+syn match modula2IllegalIdent "[a-zA-Z][a-zA-Z0-9]*\(_\+[a-zA-Z0-9]\+\)*_\+\>"
+
+
+" -----------------------------------------------------------------------------
+" Define Rendering Styles
+" -----------------------------------------------------------------------------
+
+" highlight default link modula2PredefIdentStyle Keyword
+" highlight default link modula2ConstIdentStyle modula2PredefIdentStyle
+" highlight default link modula2TypeIdentStyle modula2PredefIdentStyle
+" highlight default link modula2ProcIdentStyle modula2PredefIdentStyle
+" highlight default link modula2FuncIdentStyle modula2PredefIdentStyle
+" highlight default link modula2MacroIdentStyle modula2PredefIdentStyle
+
+highlight default link modula2ConstIdentStyle Constant
+highlight default link modula2TypeIdentStyle Type
+highlight default link modula2ProcIdentStyle Function
+highlight default link modula2FuncIdentStyle Function
+highlight default link modula2MacroIdentStyle Function
+highlight default link modula2UnsafeIdentStyle Question
+highlight default link modula2NonPortableIdentStyle Question
+highlight default link modula2StringLiteralStyle String
+highlight default link modula2CommentStyle Comment
+highlight default link modula2PragmaStyle PreProc
+highlight default link modula2DialectTagStyle SpecialComment
+highlight default link modula2TechDebtMarkerStyle SpecialComment
+highlight default link modula2ReswordStyle Keyword
+highlight default link modula2HeaderIdentStyle Function
+highlight default link modula2UserDefIdentStyle Normal
+highlight default link modula2NumericLiteralStyle Number
+highlight default link modula2PunctuationStyle Delimiter
+highlight default link modula2CommentKeyStyle SpecialComment
+highlight default link modula2DisabledCodeStyle NonText
+
+" -----------------------------------------------------------------------------
+" Assign Rendering Styles
+" -----------------------------------------------------------------------------
+
+" headers
+highlight default link modula2ModuleIdent modula2HeaderIdentStyle
+highlight default link modula2ProcedureIdent modula2HeaderIdentStyle
+highlight default link modula2ModuleHeader Normal
+highlight default link modula2ModuleTail Normal
+highlight default link modula2ProcedureHeader Normal
+highlight default link modula2ProcedureTail Normal
+
+" lowline identifiers are rendered as errors if g:modula2_iso_allow_lowline is unset
+if exists("g:modula2_iso_allow_lowline")
+  if g:modula2_iso_allow_lowline != 0
+    highlight default link modula2ProcedureLowlineIdent modula2HeaderIdentStyle
+  else
+    highlight default link modula2ProcedureLowlineIdent Error
+  endif
+else
+  highlight default link modula2ProcedureLowlineIdent modula2HeaderIdentStyle
+endif
+
+" reserved words
+highlight default link modula2Resword modula2ReswordStyle
+highlight default link modula2ReswordModule modula2ReswordStyle
+highlight default link modula2ReswordProcedure modula2ReswordStyle
+highlight default link modula2ReswordEnd modula2ReswordStyle
+
+" predefined identifiers
+highlight default link modula2ConstIdent modula2ConstIdentStyle
+highlight default link modula2TypeIdent modula2TypeIdentStyle
+highlight default link modula2ProcIdent modula2ProcIdentStyle
+highlight default link modula2FuncIdent modula2FuncIdentStyle
+highlight default link modula2MacroIdent modula2MacroIdentStyle
+
+" unsafe and non-portable identifiers
+highlight default link modula2UnsafeIdent modula2UnsafeIdentStyle
+highlight default link modula2NonPortableIdent modula2NonPortableIdentStyle
+
+" user defined identifiers
+highlight default link modula2Ident modula2UserDefIdentStyle
+
+" lowline identifiers are rendered as errors if g:modula2_iso_allow_lowline is unset
+if exists("g:modula2_iso_allow_lowline")
+  if g:modula2_iso_allow_lowline != 0
+    highlight default link modula2LowLineIdent modula2UserDefIdentStyle
+  else
+    highlight default link modula2LowLineIdent Error
+  endif
+else
+  highlight default link modula2LowLineIdent modula2UserDefIdentStyle
+endif
+
+" literals
+highlight default link modula2String modula2StringLiteralStyle
+highlight default link modula2Num modula2NumericLiteralStyle
+
+" octal literals are rendered as errors if g:modula2_iso_disallow_octals is set
+if exists("g:modula2_iso_disallow_octals")
+  if g:modula2_iso_disallow_octals != 0
+    highlight default link modula2Octal Error
+  else
+    highlight default link modula2Octal modula2NumericLiteralStyle
+  endif
+else
+  highlight default link modula2Octal modula2NumericLiteralStyle
+endif
+
+" punctuation
+highlight default link modula2Punctuation modula2PunctuationStyle
+
+" synonyms & and ~ are rendered as errors if g:modula2_iso_disallow_synonyms is set
+if exists("g:modula2_iso_disallow_synonyms")
+  if g:modula2_iso_disallow_synonyms != 0
+    highlight default link modula2Synonym Error
+  else
+    highlight default link modula2Synonym modula2PunctuationStyle
+  endif
+else
+  highlight default link modula2Synonym modula2PunctuationStyle
+endif
+
+" pragmas
+highlight default link modula2Pragma modula2PragmaStyle
+highlight default link modula2DialectTag modula2DialectTagStyle
+
+" comments
+highlight default link modula2Comment modula2CommentStyle
+highlight default link modula2CommentKey modula2CommentKeyStyle
+
+" technical debt markers
+highlight default link modula2TechDebtMarker modula2TechDebtMarkerStyle
+
+" disabled code
+highlight default link modula2DisabledCode modula2DisabledCodeStyle
+
+" illegal symbols
+highlight default link modula2IllegalChar Error
+highlight default link modula2IllegalIdent Error
+
+
+let b:current_syntax = "modula2"
+
+" vim: ts=4
+
+" END OF FILE
diff --git a/runtime/syntax/modula2/opt/pim.vim b/runtime/syntax/modula2/opt/pim.vim
new file mode 100644
index 0000000..1626db9
--- /dev/null
+++ b/runtime/syntax/modula2/opt/pim.vim
@@ -0,0 +1,377 @@
+" Vim syntax file
+" Language:    Modula-2 (PIM)
+" Maintainer:  B.Kowarsch <trijezdci@moc.liamg>
+" Last Change: 2016 August 22
+
+" ----------------------------------------------------
+" THIS FILE IS LICENSED UNDER THE VIM LICENSE
+" see https://github.com/vim/vim/blob/master/LICENSE
+" ----------------------------------------------------
+
+" Remarks:
+" Vim Syntax files are available for the following Modula-2 dialects:
+" * for the PIM dialect : m2pim.vim (this file)
+" * for the ISO dialect : m2iso.vim
+" * for the R10 dialect : m2r10.vim
+
+" -----------------------------------------------------------------------------
+" This syntax description follows the 3rd and 4th editions of N.Wirth's Book
+" Programming in Modula-2 (aka PIM) plus the following language extensions:
+" * non-leading, non-trailing, non-consecutive lowlines _ in identifiers
+" * widely supported non-standard types BYTE, LONGCARD and LONGBITSET
+" * non-nesting code disabling tags ?< and >? at the start of a line
+" -----------------------------------------------------------------------------
+
+" Parameters:
+"
+" Vim's filetype script recognises Modula-2 dialect tags within the first 200
+" lines of Modula-2 .def and .mod input files.  The script sets filetype and
+" dialect automatically when a valid dialect tag is found in the input file.
+" The dialect tag for the PIM dialect is (*!m2pim*).  It is recommended to put
+" the tag immediately after the module header in the Modula-2 input file.
+"
+" Example:
+"  DEFINITION MODULE Foolib; (*!m2pim*)
+"
+" Variable g:modula2_default_dialect sets the default Modula-2 dialect when the
+" dialect cannot be determined from the contents of the Modula-2 input file:
+" if defined and set to 'm2pim', the default dialect is PIM.
+"
+" Variable g:modula2_pim_allow_lowline controls support for lowline in identifiers:
+" if defined and set to a non-zero value, they are recognised, otherwise not
+"
+" Variable g:modula2_pim_disallow_octals controls the rendering of octal literals:
+" if defined and set to a non-zero value, they are rendered as errors.
+"
+" Variable g:modula2_pim_disallow_synonyms controls the rendering of & and ~:
+" if defined and set to a non-zero value, they are rendered as errors.
+"
+" Variables may be defined in Vim startup file .vimrc
+"
+" Examples:
+"  let g:modula2_default_dialect = 'm2pim'
+"  let g:modula2_pim_allow_lowline = 1
+"  let g:modula2_pim_disallow_octals = 1
+"  let g:modula2_pim_disallow_synonyms = 1
+
+
+if exists("b:current_syntax")
+  finish
+endif
+
+" Modula-2 is case sensitive
+syn case match
+
+
+" -----------------------------------------------------------------------------
+" Reserved Words
+" -----------------------------------------------------------------------------
+syn keyword modula2Resword AND ARRAY BEGIN BY CASE CONST DEFINITION DIV DO ELSE
+syn keyword modula2Resword ELSIF EXIT EXPORT FOR FROM IF IMPLEMENTATION IMPORT
+syn keyword modula2Resword IN LOOP MOD NOT OF OR POINTER QUALIFIED RECORD REPEAT
+syn keyword modula2Resword RETURN SET THEN TO TYPE UNTIL VAR WHILE WITH
+
+
+" -----------------------------------------------------------------------------
+" Builtin Constant Identifiers
+" -----------------------------------------------------------------------------
+syn keyword modula2ConstIdent FALSE NIL TRUE
+
+
+" -----------------------------------------------------------------------------
+" Builtin Type Identifiers
+" -----------------------------------------------------------------------------
+syn keyword modula2TypeIdent BITSET BOOLEAN CHAR PROC
+syn keyword modula2TypeIdent CARDINAL INTEGER LONGINT REAL LONGREAL
+
+
+" -----------------------------------------------------------------------------
+" Builtin Procedure and Function Identifiers
+" -----------------------------------------------------------------------------
+syn keyword modula2ProcIdent CAP DEC EXCL HALT INC INCL
+syn keyword modula2FuncIdent ABS CHR FLOAT HIGH MAX MIN ODD ORD SIZE TRUNC VAL
+
+
+" -----------------------------------------------------------------------------
+" Wirthian Macro Identifiers
+" -----------------------------------------------------------------------------
+syn keyword modula2MacroIdent NEW DISPOSE
+
+
+" -----------------------------------------------------------------------------
+" Unsafe Facilities via Pseudo-Module SYSTEM
+" -----------------------------------------------------------------------------
+syn keyword modula2UnsafeIdent ADDRESS PROCESS WORD
+syn keyword modula2UnsafeIdent ADR TSIZE NEWPROCESS TRANSFER SYSTEM
+
+
+" -----------------------------------------------------------------------------
+" Non-Portable Language Extensions
+" -----------------------------------------------------------------------------
+syn keyword modula2NonPortableIdent BYTE LONGCARD LONGBITSET
+
+
+" -----------------------------------------------------------------------------
+" User Defined Identifiers
+" -----------------------------------------------------------------------------
+syn match modula2Ident "[a-zA-Z][a-zA-Z0-9]*\(_\)\@!"
+syn match modula2LowLineIdent "[a-zA-Z][a-zA-Z0-9]*\(_[a-zA-Z0-9]\+\)\+"
+
+
+" -----------------------------------------------------------------------------
+" String Literals
+" -----------------------------------------------------------------------------
+syn region modula2String start=/"/ end=/"/ oneline
+syn region modula2String start=/'/ end=/'/ oneline
+
+
+" -----------------------------------------------------------------------------
+" Numeric Literals
+" -----------------------------------------------------------------------------
+syn match modula2Num
+  \ "\(\([0-7]\+\)[BC]\@!\|[89]\)[0-9]*\(\.[0-9]\+\([eE][+-]\?[0-9]\+\)\?\)\?"
+syn match modula2Num "[0-9A-F]\+H"
+syn match modula2Octal "[0-7]\+[BC]"
+
+
+" -----------------------------------------------------------------------------
+" Punctuation
+" -----------------------------------------------------------------------------
+syn match modula2Punctuation
+  \ "\.\|[,:;]\|\*\|[/+-]\|\#\|[=<>]\|\^\|\[\|\]\|(\(\*\)\@!\|[){}]"
+syn match modula2Synonym "[&~]"
+
+
+" -----------------------------------------------------------------------------
+" Pragmas
+" -----------------------------------------------------------------------------
+syn region modula2Pragma start="(\*\$" end="\*)"
+syn match modula2DialectTag "(\*!m2pim\(+[a-z0-9]\+\)\?\*)"
+
+" -----------------------------------------------------------------------------
+" Block Comments
+" -----------------------------------------------------------------------------
+syn region modula2Comment start="(\*\(\$\|!m2pim\(+[a-z0-9]\+\)\?\*)\)\@!" end="\*)"
+  \ contains = modula2Comment, modula2CommentKey, modula2TechDebtMarker
+syn match modula2CommentKey "[Aa]uthor[s]\?\|[Cc]opyright\|[Ll]icense\|[Ss]ynopsis"
+syn match modula2CommentKey "\([Pp]re\|[Pp]ost\|[Ee]rror\)\-condition[s]\?:"
+
+
+" -----------------------------------------------------------------------------
+" Technical Debt Markers
+" -----------------------------------------------------------------------------
+syn keyword modula2TechDebtMarker contained DEPRECATED FIXME
+syn match modula2TechDebtMarker "TODO[:]\?" contained
+
+" -----------------------------------------------------------------------------
+" Disabled Code Sections
+" -----------------------------------------------------------------------------
+syn region modula2DisabledCode start="^?<" end="^>?"
+
+
+" -----------------------------------------------------------------------------
+" Headers
+" -----------------------------------------------------------------------------
+" !!! this section must be second last !!!
+
+" new module header
+syn match modula2ModuleHeader
+  \ "MODULE\( [A-Z][a-zA-Z0-9]*\)\?"
+  \ contains = modula2ReswordModule, modula2ModuleIdent
+
+syn match modula2ModuleIdent
+  \ "[A-Z][a-zA-Z0-9]*" contained
+
+syn match modula2ModuleTail
+  \ "END [A-Z][a-zA-Z0-9]*\.$"
+  \ contains = modula2ReswordEnd, modula2ModuleIdent, modula2Punctuation
+
+" new procedure header
+syn match modula2ProcedureHeader
+  \ "PROCEDURE\( [a-zA-Z][a-zA-Z0-9]*\(_[a-zA-Z0-9]\+\)*\)\?"
+  \ contains = modula2ReswordProcedure,
+  \ modula2ProcedureIdent, modula2ProcedureLowlineIdent, modula2IllegalChar, modula2IllegalIdent
+
+syn match modula2ProcedureIdent
+  \ "\([a-zA-Z]\)\([a-zA-Z0-9]*\)" contained
+
+syn match modula2ProcedureLowlineIdent
+  \ "[a-zA-Z][a-zA-Z0-9]*\(_[a-zA-Z0-9]\+\)\+" contained
+
+syn match modula2ProcedureTail
+  \ "END\( \([a-zA-Z][a-zA-Z0-9]*\(_[a-zA-Z0-9]\+\)*\)[.;]$\)\?"
+  \ contains = modula2ReswordEnd,
+  \ modula2ProcedureIdent, modula2ProcedureLowLineIdent,
+  \ modula2Punctuation, modula2IllegalChar, modula2IllegalIdent
+
+syn keyword modula2ReswordModule contained MODULE
+syn keyword modula2ReswordProcedure contained PROCEDURE
+syn keyword modula2ReswordEnd contained END
+
+
+" -----------------------------------------------------------------------------
+" Illegal Symbols
+" -----------------------------------------------------------------------------
+" !!! this section must be last !!!
+
+" any '`' '!' '@ ''$' '%' or '\'
+syn match modula2IllegalChar "[`!@$%\\]"
+
+" any solitary sequence of '_'
+syn match modula2IllegalChar "\<_\+\>"
+
+" any '?' at start of line if not followed by '<'
+syn match modula2IllegalChar "^?\(<\)\@!"
+
+" any '?' not following '>' at start of line
+syn match modula2IllegalChar "\(\(^>\)\|\(^\)\)\@<!?"
+
+" any identifiers with leading occurrences of '_'
+syn match modula2IllegalIdent "_\+[a-zA-Z][a-zA-Z0-9]*\(_\+[a-zA-Z0-9]*\)*"
+
+" any identifiers containing consecutive occurences of '_'
+syn match modula2IllegalIdent
+  \ "[a-zA-Z][a-zA-Z0-9]*\(_[a-zA-Z0-9]\+\)*\(__\+[a-zA-Z0-9]\+\(_[a-zA-Z0-9]\+\)*\)\+"
+
+" any identifiers with trailing occurrences of '_'
+syn match modula2IllegalIdent "[a-zA-Z][a-zA-Z0-9]*\(_\+[a-zA-Z0-9]\+\)*_\+\>"
+
+
+" -----------------------------------------------------------------------------
+" Define Rendering Styles
+" -----------------------------------------------------------------------------
+
+" highlight default link modula2PredefIdentStyle Keyword
+" highlight default link modula2ConstIdentStyle modula2PredefIdentStyle
+" highlight default link modula2TypeIdentStyle modula2PredefIdentStyle
+" highlight default link modula2ProcIdentStyle modula2PredefIdentStyle
+" highlight default link modula2FuncIdentStyle modula2PredefIdentStyle
+" highlight default link modula2MacroIdentStyle modula2PredefIdentStyle
+
+highlight default link modula2ConstIdentStyle Constant
+highlight default link modula2TypeIdentStyle Type
+highlight default link modula2ProcIdentStyle Function
+highlight default link modula2FuncIdentStyle Function
+highlight default link modula2MacroIdentStyle Function
+highlight default link modula2UnsafeIdentStyle Question
+highlight default link modula2NonPortableIdentStyle Question
+highlight default link modula2StringLiteralStyle String
+highlight default link modula2CommentStyle Comment
+highlight default link modula2PragmaStyle PreProc
+highlight default link modula2DialectTagStyle SpecialComment
+highlight default link modula2TechDebtMarkerStyle SpecialComment
+highlight default link modula2ReswordStyle Keyword
+highlight default link modula2HeaderIdentStyle Function
+highlight default link modula2UserDefIdentStyle Normal
+highlight default link modula2NumericLiteralStyle Number
+highlight default link modula2PunctuationStyle Delimiter
+highlight default link modula2CommentKeyStyle SpecialComment
+highlight default link modula2DisabledCodeStyle NonText
+
+" -----------------------------------------------------------------------------
+" Assign Rendering Styles
+" -----------------------------------------------------------------------------
+
+" headers
+highlight default link modula2ModuleIdent modula2HeaderIdentStyle
+highlight default link modula2ProcedureIdent modula2HeaderIdentStyle
+highlight default link modula2ModuleHeader Normal
+highlight default link modula2ModuleTail Normal
+highlight default link modula2ProcedureHeader Normal
+highlight default link modula2ProcedureTail Normal
+
+" lowline identifiers are rendered as errors if g:modula2_pim_allow_lowline is unset
+if exists("g:modula2_pim_allow_lowline")
+  if g:modula2_pim_allow_lowline != 0
+    highlight default link modula2ProcedureLowlineIdent modula2HeaderIdentStyle
+  else
+    highlight default link modula2ProcedureLowlineIdent Error
+  endif
+else
+  highlight default link modula2ProcedureLowlineIdent Error
+endif
+
+" reserved words
+highlight default link modula2Resword modula2ReswordStyle
+highlight default link modula2ReswordModule modula2ReswordStyle
+highlight default link modula2ReswordProcedure modula2ReswordStyle
+highlight default link modula2ReswordEnd modula2ReswordStyle
+
+" predefined identifiers
+highlight default link modula2ConstIdent modula2ConstIdentStyle
+highlight default link modula2TypeIdent modula2TypeIdentStyle
+highlight default link modula2ProcIdent modula2ProcIdentStyle
+highlight default link modula2FuncIdent modula2FuncIdentStyle
+highlight default link modula2MacroIdent modula2MacroIdentStyle
+
+" unsafe and non-portable identifiers
+highlight default link modula2UnsafeIdent modula2UnsafeIdentStyle
+highlight default link modula2NonPortableIdent modula2NonPortableIdentStyle
+
+" user defined identifiers
+highlight default link modula2Ident modula2UserDefIdentStyle
+
+" lowline identifiers are rendered as errors if g:modula2_pim_allow_lowline is unset
+if exists("g:modula2_pim_allow_lowline")
+  if g:modula2_pim_allow_lowline != 0
+    highlight default link modula2LowLineIdent modula2UserDefIdentStyle
+  else
+    highlight default link modula2LowLineIdent Error
+  endif
+else
+  highlight default link modula2LowLineIdent Error
+endif
+
+" literals
+highlight default link modula2String modula2StringLiteralStyle
+highlight default link modula2Num modula2NumericLiteralStyle
+
+" octal literals are rendered as errors if g:modula2_pim_disallow_octals is set
+if exists("g:modula2_pim_disallow_octals")
+  if g:modula2_pim_disallow_octals != 0
+    highlight default link modula2Octal Error
+  else
+    highlight default link modula2Octal modula2NumericLiteralStyle
+  endif
+else
+  highlight default link modula2Octal modula2NumericLiteralStyle
+endif
+
+" punctuation
+highlight default link modula2Punctuation modula2PunctuationStyle
+
+" synonyms & and ~ are rendered as errors if g:modula2_pim_disallow_synonyms is set
+if exists("g:modula2_pim_disallow_synonyms")
+  if g:modula2_pim_disallow_synonyms != 0
+    highlight default link modula2Synonym Error
+  else
+    highlight default link modula2Synonym modula2PunctuationStyle
+  endif
+else
+  highlight default link modula2Synonym modula2PunctuationStyle
+endif
+
+" pragmas
+highlight default link modula2Pragma modula2PragmaStyle
+highlight default link modula2DialectTag modula2DialectTagStyle
+
+" comments
+highlight default link modula2Comment modula2CommentStyle
+highlight default link modula2CommentKey modula2CommentKeyStyle
+
+" technical debt markers
+highlight default link modula2TechDebtMarker modula2TechDebtMarkerStyle
+
+" disabled code
+highlight default link modula2DisabledCode modula2DisabledCodeStyle
+
+" illegal symbols
+highlight default link modula2IllegalChar Error
+highlight default link modula2IllegalIdent Error
+
+
+let b:current_syntax = "modula2"
+
+" vim: ts=4
+
+" END OF FILE
diff --git a/runtime/syntax/modula2/opt/r10.vim b/runtime/syntax/modula2/opt/r10.vim
new file mode 100644
index 0000000..775f498
--- /dev/null
+++ b/runtime/syntax/modula2/opt/r10.vim
@@ -0,0 +1,452 @@
+" Vim syntax file
+" Language:    Modula-2 (R10)
+" Maintainer:  B.Kowarsch <trijezdci@moc.liamg>
+" Last Change: 2020 June 18 (moved repository from bb to github)
+
+" ----------------------------------------------------
+" THIS FILE IS LICENSED UNDER THE VIM LICENSE
+" see https://github.com/vim/vim/blob/master/LICENSE
+" ----------------------------------------------------
+
+" Remarks:
+" Vim Syntax files are available for the following Modula-2 dialects:
+" * for the PIM dialect : m2pim.vim
+" * for the ISO dialect : m2iso.vim
+" * for the R10 dialect : m2r10.vim (this file)
+
+" -----------------------------------------------------------------------------
+" This syntax description follows the Modula-2 Revision 2010 language report
+" (Kowarsch and Sutcliffe, 2015) available at http://modula-2.info/m2r10.
+" -----------------------------------------------------------------------------
+
+" Parameters:
+"
+" Vim's filetype script recognises Modula-2 dialect tags within the first 200
+" lines of Modula-2 .def and .mod input files.  The script sets filetype and
+" dialect automatically when a valid dialect tag is found in the input file.
+" The dialect tag for the R10 dialect is (*!m2r10*).  It is recommended to put
+" the tag immediately after the module header in the Modula-2 input file.
+"
+" Example:
+"  DEFINITION MODULE Foolib; (*!m2r10*)
+"
+" Variable g:modula2_default_dialect sets the default Modula-2 dialect when the
+" dialect cannot be determined from the contents of the Modula-2 input file:
+" if defined and set to 'm2r10', the default dialect is R10.
+"
+" Variable g:modula2_r10_allow_lowline controls support for lowline in identifiers:
+" if defined and set to a non-zero value, they are recognised, otherwise not
+"
+" Variables may be defined in Vim startup file .vimrc
+"
+" Examples:
+"  let g:modula2_default_dialect = 'm2r10'
+"  let g:modula2_r10_allow_lowline = 1
+
+
+if exists("b:current_syntax")
+  finish
+endif
+
+" Modula-2 is case sensitive
+syn case match
+
+
+" -----------------------------------------------------------------------------
+" Reserved Words
+" -----------------------------------------------------------------------------
+" Note: MODULE, PROCEDURE and END are defined separately further below
+syn keyword modula2Resword ALIAS AND ARGLIST ARRAY BEGIN CASE CONST COPY DEFINITION
+syn keyword modula2Resword DIV DO ELSE ELSIF EXIT FOR FROM GENLIB IF IMPLEMENTATION
+syn keyword modula2Resword IMPORT IN LOOP MOD NEW NOT OF OPAQUE OR POINTER READ
+syn keyword modula2Resword RECORD RELEASE REPEAT RETAIN RETURN SET THEN TO TYPE
+syn keyword modula2Resword UNTIL VAR WHILE WRITE YIELD
+
+
+" -----------------------------------------------------------------------------
+" Schroedinger's Tokens
+" -----------------------------------------------------------------------------
+syn keyword modula2SchroedToken CAPACITY COROUTINE LITERAL
+
+
+" -----------------------------------------------------------------------------
+" Builtin Constant Identifiers
+" -----------------------------------------------------------------------------
+syn keyword modula2ConstIdent NIL FALSE TRUE
+
+
+" -----------------------------------------------------------------------------
+" Builtin Type Identifiers
+" -----------------------------------------------------------------------------
+syn keyword modula2TypeIdent BOOLEAN CHAR UNICHAR OCTET
+syn keyword modula2TypeIdent CARDINAL LONGCARD INTEGER LONGINT REAL LONGREAL
+
+
+" -----------------------------------------------------------------------------
+" Builtin Procedure and Function Identifiers
+" -----------------------------------------------------------------------------
+syn keyword modula2ProcIdent APPEND INSERT REMOVE SORT SORTNEW
+syn keyword modula2FuncIdent CHR ORD ODD ABS SGN MIN MAX LOG2 POW2 ENTIER
+syn keyword modula2FuncIdent PRED SUCC PTR COUNT LENGTH
+
+
+" -----------------------------------------------------------------------------
+" Builtin Macro Identifiers
+" -----------------------------------------------------------------------------
+syn keyword modula2MacroIdent NOP TMIN TMAX TSIZE TLIMIT
+
+
+" -----------------------------------------------------------------------------
+" Builtin Primitives
+" -----------------------------------------------------------------------------
+syn keyword modula2PrimitiveIdent SXF VAL STORE VALUE SEEK SUBSET
+
+
+" -----------------------------------------------------------------------------
+" Unsafe Facilities via Pseudo-Module UNSAFE
+" -----------------------------------------------------------------------------
+syn keyword modula2UnsafeIdent UNSAFE BYTE WORD LONGWORD OCTETSEQ
+syn keyword modula2UnsafeIdent ADD SUB INC DEC SETBIT HALT
+syn keyword modula2UnsafeIdent ADR CAST BIT SHL SHR BWNOT BWAND BWOR
+
+
+" -----------------------------------------------------------------------------
+" Non-Portable Language Extensions
+" -----------------------------------------------------------------------------
+syn keyword modula2NonPortableIdent ASSEMBLER ASM REG
+
+
+" -----------------------------------------------------------------------------
+" User Defined Identifiers
+" -----------------------------------------------------------------------------
+syn match modula2Ident "[a-zA-Z][a-zA-Z0-9]*\(_\)\@!"
+syn match modula2LowLineIdent "[a-zA-Z][a-zA-Z0-9]*\(_[a-zA-Z0-9]\+\)\+"
+
+syn match modula2ReswordDo "\(TO\)\@<!DO"
+syn match modula2ReswordTo "TO\(\sDO\)\@!"
+
+" TODO: support for OpenVMS reswords and identifiers which may include $ and %
+
+
+" -----------------------------------------------------------------------------
+" String Literals
+" -----------------------------------------------------------------------------
+syn region modula2String start=/"/ end=/"/ oneline
+syn region modula2String start="\(^\|\s\|[({=<>&#,]\|\[\)\@<='" end=/'/ oneline
+
+
+" -----------------------------------------------------------------------------
+" Numeric Literals
+" -----------------------------------------------------------------------------
+syn match modula2Base2Num "0b[01]\+\('[01]\+\)*"
+syn match modula2Base16Num "0[ux][0-9A-F]\+\('[0-9A-F]\+\)*"
+
+"| *** VMSCRIPT BUG ALERT ***
+"| The regular expression below causes errors when split into separate strings
+"|
+"| syn match modula2Base10Num
+"|   \ "\(\(0[bux]\@!\|[1-9]\)[0-9]*\('[0-9]\+\)*\)" .
+"|   \ "\(\.[0-9]\+\('[0-9]\+\)*\(e[+-]\?[0-9]\+\('[0-9]\+\)*\)\?\)\?"
+"|
+"| E475: Invalid argument: modula2Base10Num "\(\(0[bux]\@!\|[1-9]\)[0-9]*\('[0-9]\+\)*\)"
+"|  . "\(\.[0-9]\+\('[0-9]\+\)*\(e[+-]\?[0-9]\+\('[0-9]\+\)*\)\?\)\?"
+"|
+"| However, the same regular expression works just fine as a sole string.
+"|
+"| As a consequence, we have no choice but to put it all into a single line
+"| which greatly diminishes readability and thereby increases the opportunity
+"| for error during maintenance. Ideally, regular expressions should be split
+"| into small human readable pieces with interleaved comments that explain
+"| precisely what each piece is doing.  Vimscript imposes poor design. :-(
+
+syn match modula2Base10Num
+  \ "\(\(0[bux]\@!\|[1-9]\)[0-9]*\('[0-9]\+\)*\)\(\.[0-9]\+\('[0-9]\+\)*\(e[+-]\?[0-9]\+\('[0-9]\+\)*\)\?\)\?"
+
+
+" -----------------------------------------------------------------------------
+" Punctuation
+" -----------------------------------------------------------------------------
+syn match modula2Punctuation
+  \ "\.\|[,:;]\|\*\|[/+-]\|\#\|[=<>&]\|\^\|\[\|\]\|(\(\*\)\@!\|[){}]"
+
+
+" -----------------------------------------------------------------------------
+" Pragmas
+" -----------------------------------------------------------------------------
+syn region modula2Pragma start="<\*" end="\*>"
+  \ contains = modula2PragmaKey, modula2TechDebtPragma
+syn keyword modula2PragmaKey contained MSG IF ELSIF ELSE END INLINE NOINLINE OUT
+syn keyword modula2PragmaKey contained GENERATED ENCODING ALIGN PADBITS NORETURN
+syn keyword modula2PragmaKey contained PURITY SINGLEASSIGN LOWLATENCY VOLATILE
+syn keyword modula2PragmaKey contained FORWARD ADDR FFI FFIDENT
+
+syn match modula2DialectTag "(\*!m2r10\(+[a-z0-9]\+\)\?\*)"
+
+
+" -----------------------------------------------------------------------------
+" Line Comments
+" -----------------------------------------------------------------------------
+syn region modula2Comment start=/^!/ end=/$/ oneline
+
+
+" -----------------------------------------------------------------------------
+" Block Comments
+" -----------------------------------------------------------------------------
+syn region modula2Comment
+  \ start="\(END\s\)\@<!(\*\(!m2r10\(+[a-z0-9]\+\)\?\*)\)\@!" end="\*)"
+  \ contains = modula2Comment, modula2CommentKey, modula2TechDebtMarker
+
+syn match modula2CommentKey
+  \ "[Aa]uthor[s]\?\|[Cc]opyright\|[Ll]icense\|[Ss]ynopsis" contained
+syn match modula2CommentKey
+  \ "\([Pp]re\|[Pp]ost\|[Ee]rror\)\-condition[s]\?:" contained
+
+
+" -----------------------------------------------------------------------------
+" Block Statement Tails
+" -----------------------------------------------------------------------------
+syn match modula2ReswordEnd
+  \ "END" nextgroup = modula2StmtTailComment skipwhite
+syn match modula2StmtTailComment
+  \ "(\*\s\(IF\|CASE\|FOR\|LOOP\|WHILE\)\s\*)" contained
+
+
+" -----------------------------------------------------------------------------
+" Technical Debt Markers
+" -----------------------------------------------------------------------------
+syn match modula2ToDoHeader "TO DO"
+
+syn match modula2ToDoTail
+  \ "END\(\s(\*\sTO DO\s\*)\)\@=" nextgroup = modula2ToDoTailComment skipwhite
+syntax match modula2ToDoTailComment "(\*\sTO DO\s\*)" contained
+
+" contained within pragma
+syn keyword modula2TechDebtPragma contained DEPRECATED
+
+" contained within comment
+syn keyword modula2TechDebtMarker contained FIXME
+
+
+" -----------------------------------------------------------------------------
+" Disabled Code Sections
+" -----------------------------------------------------------------------------
+syn region modula2DisabledCode start="^?<" end="^>?"
+
+
+" -----------------------------------------------------------------------------
+" Headers
+" -----------------------------------------------------------------------------
+" !!! this section must be second last !!!
+
+" module header
+syn match modula2ModuleHeader
+  \ "\(MODULE\|BLUEPRINT\)\( [A-Z][a-zA-Z0-9]*\)\?"
+  \ contains = modula2ReswordModule, modula2ReswordBlueprint, modula2ModuleIdent
+
+syn match modula2ModuleIdent
+  \ "[A-Z][a-zA-Z0-9]*" contained
+
+syn match modula2ModuleTail
+  \ "END [A-Z][a-zA-Z0-9]*\.$"
+  \ contains = modula2ReswordEnd, modula2ModuleIdent, modula2Punctuation
+
+" procedure, sole occurrence
+syn match modula2ProcedureHeader
+  \ "PROCEDURE\(\s\[\|\s[a-zA-Z]\)\@!" contains = modula2ReswordProcedure
+
+" procedure header
+syn match modula2ProcedureHeader
+  \ "PROCEDURE [a-zA-Z][a-zA-Z0-9]*\(_[a-zA-Z0-9]\+\)*"
+  \ contains = modula2ReswordProcedure,
+  \ modula2ProcedureIdent, modula2ProcedureLowlineIdent, modula2IllegalChar, modula2IllegalIdent
+
+" procedure binding to operator
+syn match modula2ProcedureHeader
+  \ "PROCEDURE \[[+-\*/\\=<>]\] [a-zA-Z][a-zA-Z0-9]*\(_[a-zA-Z0-9]\+\)*"
+  \ contains = modula2ReswordProcedure, modula2Punctuation,
+  \ modula2ProcedureIdent, modula2ProcedureLowlineIdent, modula2IllegalChar, modula2IllegalIdent
+
+" procedure binding to builtin
+syn match modula2ProcedureHeader
+  \ "PROCEDURE \[[A-Z]\+\(:\([#\*,]\|++\|--\)\?\)\?\] [a-zA-Z][a-zA-Z0-9]*\(_[a-zA-Z0-9]\+\)*"
+  \ contains = modula2ReswordProcedure,
+  \ modula2Punctuation, modula2Resword, modula2SchroedToken,
+  \ modula2ProcIdent, modula2FuncIdent, modula2PrimitiveIdent,
+  \ modula2ProcedureIdent, modula2ProcedureLowlineIdent, modula2IllegalChar, modula2IllegalIdent
+
+syn match modula2ProcedureIdent
+  \ "\([a-zA-Z]\)\([a-zA-Z0-9]*\)" contained
+
+syn match modula2ProcedureLowlineIdent
+  \ "[a-zA-Z][a-zA-Z0-9]*\(_[a-zA-Z0-9]\+\)\+" contained
+
+syn match modula2ProcedureTail
+  \ "END [a-zA-Z][a-zA-Z0-9]*\(_[a-zA-Z0-9]\+\)*;$"
+  \ contains = modula2ReswordEnd,
+  \ modula2ProcedureIdent, modula2ProcedureLowLineIdent,
+  \ modula2Punctuation, modula2IllegalChar, modula2IllegalIdent
+
+syn keyword modula2ReswordModule contained MODULE
+syn keyword modula2ReswordBlueprint contained BLUEPRINT
+syn keyword modula2ReswordProcedure contained PROCEDURE
+syn keyword modula2ReswordEnd contained END
+
+
+" -----------------------------------------------------------------------------
+" Illegal Symbols
+" -----------------------------------------------------------------------------
+" !!! this section must be last !!!
+
+" any '`' '~' '@' '$' '%'
+syn match modula2IllegalChar "[`~@$%]"
+
+" any solitary sequence of '_'
+syn match modula2IllegalChar "\<_\+\>"
+
+" any '?' at start of line if not followed by '<'
+syn match modula2IllegalChar "^?\(<\)\@!"
+
+" any '?' not following '>' at start of line
+syn match modula2IllegalChar "\(\(^>\)\|\(^\)\)\@<!?"
+
+" any identifiers with leading occurrences of '_'
+syn match modula2IllegalIdent "_\+[a-zA-Z][a-zA-Z0-9]*\(_\+[a-zA-Z0-9]*\)*"
+
+" any identifiers containing consecutive occurences of '_'
+syn match modula2IllegalIdent
+  \ "[a-zA-Z][a-zA-Z0-9]*\(_[a-zA-Z0-9]\+\)*\(__\+[a-zA-Z0-9]\+\(_[a-zA-Z0-9]\+\)*\)\+"
+
+" any identifiers with trailing occurrences of '_'
+syn match modula2IllegalIdent "[a-zA-Z][a-zA-Z0-9]*\(_\+[a-zA-Z0-9]\+\)*_\+\>"
+
+
+" -----------------------------------------------------------------------------
+" Define Rendering Styles
+" -----------------------------------------------------------------------------
+
+" highlight default link modula2PredefIdentStyle Keyword
+" highlight default link modula2ConstIdentStyle modula2PredefIdentStyle
+" highlight default link modula2TypeIdentStyle modula2PredefIdentStyle
+" highlight default link modula2ProcIdentStyle modula2PredefIdentStyle
+" highlight default link modula2FuncIdentStyle modula2PredefIdentStyle
+" highlight default link modula2MacroIdentStyle modula2PredefIdentStyle
+
+highlight default link modula2ConstIdentStyle Constant
+highlight default link modula2TypeIdentStyle Type
+highlight default link modula2ProcIdentStyle Function
+highlight default link modula2FuncIdentStyle Function
+highlight default link modula2MacroIdentStyle Function
+highlight default link modula2PrimitiveIdentStyle Function
+highlight default link modula2UnsafeIdentStyle Question
+highlight default link modula2NonPortableIdentStyle Question
+highlight default link modula2StringLiteralStyle String
+highlight default link modula2CommentStyle Comment
+highlight default link modula2PragmaStyle PreProc
+highlight default link modula2PragmaKeyStyle PreProc
+highlight default link modula2DialectTagStyle SpecialComment
+highlight default link modula2TechDebtMarkerStyle SpecialComment
+highlight default link modula2ReswordStyle Keyword
+highlight default link modula2HeaderIdentStyle Function
+highlight default link modula2UserDefIdentStyle Normal
+highlight default link modula2NumericLiteralStyle Number
+highlight default link modula2PunctuationStyle Delimiter
+highlight default link modula2CommentKeyStyle SpecialComment
+highlight default link modula2DisabledCodeStyle NonText
+
+
+" -----------------------------------------------------------------------------
+" Assign Rendering Styles
+" -----------------------------------------------------------------------------
+
+" headers
+highlight default link modula2ModuleIdent modula2HeaderIdentStyle
+highlight default link modula2ProcedureIdent modula2HeaderIdentStyle
+highlight default link modula2ModuleHeader modula2HeaderIdentStyle
+highlight default link modula2ModuleTail Normal
+highlight default link modula2ProcedureHeader Normal
+highlight default link modula2ProcedureTail Normal
+
+" lowline identifiers are rendered as errors if g:modula2_r10_allow_lowline is unset
+if exists("g:modula2_r10_allow_lowline")
+  if g:modula2_r10_allow_lowline != 0
+    highlight default link modula2ProcedureLowlineIdent modula2HeaderIdentStyle
+  else
+    highlight default link modula2ProcedureLowlineIdent Error
+  endif
+else
+  highlight default link modula2ProcedureLowlineIdent modula2HeaderIdentStyle
+endif
+
+" reserved words
+highlight default link modula2Resword modula2ReswordStyle
+highlight default link modula2ReswordModule modula2ReswordStyle
+highlight default link modula2ReswordProcedure modula2ReswordStyle
+highlight default link modula2ReswordEnd modula2ReswordStyle
+highlight default link modula2ReswordDo modula2ReswordStyle
+highlight default link modula2ReswordTo modula2ReswordStyle
+highlight default link modula2SchroedToken modula2ReswordStyle
+
+" predefined identifiers
+highlight default link modula2ConstIdent modula2ConstIdentStyle
+highlight default link modula2TypeIdent modula2TypeIdentStyle
+highlight default link modula2ProcIdent modula2ProcIdentStyle
+highlight default link modula2FuncIdent modula2FuncIdentStyle
+highlight default link modula2MacroIdent modula2MacroIdentStyle
+highlight default link modula2PrimitiveIdent modula2PrimitiveIdentStyle
+
+" unsafe and non-portable identifiers
+highlight default link modula2UnsafeIdent modula2UnsafeIdentStyle
+highlight default link modula2NonPortableIdent modula2NonPortableIdentStyle
+
+" user defined identifiers
+highlight default link modula2Ident modula2UserDefIdentStyle
+
+" lowline identifiers are rendered as errors if g:modula2_r10_allow_lowline is unset
+if exists("g:modula2_r10_allow_lowline")
+  if g:modula2_r10_allow_lowline != 0
+    highlight default link modula2LowLineIdent modula2UserDefIdentStyle
+  else
+    highlight default link modula2LowLineIdent Error
+  endif
+else
+  highlight default link modula2LowLineIdent modula2UserDefIdentStyle
+endif
+
+" literals
+highlight default link modula2String modula2StringLiteralStyle
+highlight default link modula2Base2Num modula2NumericLiteralStyle
+highlight default link modula2Base10Num modula2NumericLiteralStyle
+highlight default link modula2Base16Num modula2NumericLiteralStyle
+
+" punctuation
+highlight default link modula2Punctuation modula2PunctuationStyle
+
+" pragmas
+highlight default link modula2Pragma modula2PragmaStyle
+highlight default link modula2PragmaKey modula2PragmaKeyStyle
+highlight default link modula2DialectTag modula2DialectTagStyle
+
+" comments
+highlight default link modula2Comment modula2CommentStyle
+highlight default link modula2CommentKey modula2CommentKeyStyle
+highlight default link modula2ToDoTailComment modula2CommentStyle
+highlight default link modula2StmtTailComment modula2CommentStyle
+
+" technical debt markers
+highlight default link modula2ToDoHeader modula2TechDebtMarkerStyle
+highlight default link modula2ToDoTail modula2TechDebtMarkerStyle
+highlight default link modula2TechDebtPragma modula2TechDebtMarkerStyle
+
+" disabled code
+highlight default link modula2DisabledCode modula2DisabledCodeStyle
+
+" illegal symbols
+highlight default link modula2IllegalChar Error
+highlight default link modula2IllegalIdent Error
+
+
+let b:current_syntax = "modula2"
+
+" vim: ts=4
+
+" END OF FILE
diff --git a/runtime/syntax/testdir/dumps/modula2_iso_00.dump b/runtime/syntax/testdir/dumps/modula2_iso_00.dump
new file mode 100644
index 0000000..797376f
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/modula2_iso_00.dump
@@ -0,0 +1,20 @@
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+@75
+|(+0#0000e05&|*| |-@49| +0#0000000&@21
+| +0#0000e05&|*| |T|H|I|S| |F|I|L|E| |I|S| |L|I|C|E|N|S|E|D| |U|N|D|E|R| |T|H|E| |V|I|M| |L|I|C|E|N|S|E| +0#0000000&@28
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+| +0#0000e05&|*| |-@49| |*|)| +0#0000000&@18
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+|D+0#af5f00255&|E|F|I|N|I|T|I|O|N| +0#0000000&|M+0#af5f00255&|O|D|U|L|E| +0#0000000&|F+0#00e0e07&|o@1|b|a|r|;+0#e000e06&| +0#0000000&|(+0#e000e06&|*|!|m|2|i|s|o|*|)| +0#0000000&@38
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+|F+0#e000002&|A|L|S|E| +0#0000000&|N+0#e000002&|I|L| +0#0000000&|T+0#e000002&|R|U|E| +0#0000000&|I+0#e000002&|N|T|E|R@1|U|P|T|I|B|L|E| +0#0000000&|U+0#e000002&|N|I|N|T|E|R@1|U|P|T|I|B|L|E| +0#0000000&@30
+@75
+|"|i|n|p|u|t|/|m|o|d|u|l|a|2|_|i|s|o|.|d|e|f|"| |1@1|4|L|,| |2|3|1|8|B| @21|1|,|1| @10|T|o|p| 
diff --git a/runtime/syntax/testdir/dumps/modula2_iso_01.dump b/runtime/syntax/testdir/dumps/modula2_iso_01.dump
new file mode 100644
index 0000000..8b7d2f2
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/modula2_iso_01.dump
@@ -0,0 +1,20 @@
+| +0&#ffffff0@74
+|T+0#af5f00255&|Y|P|E| +0#0000000&|F|o@1| |=+0#e000e06&| +0#0000000&|P+0#af5f00255&|O|I|N|T|E|R| +0#0000000&|T+0#af5f00255&|O| +0#0000000&|B|a|r|;+0#e000e06&| +0#0000000&@48
+@75
+|(+0#0000e05&|*| |p|r|e|d|e|f|i|n|e|d| |c|o|n|s|t|a|n|t|s| |*|)| +0#0000000&@48
+|F+0#e000002&|A|L|S|E| +0#0000000&|N+0#e000002&|I|L| +0#0000000&|T+0#e000002&|R|U|E| +0#0000000&|I+0#e000002&|N|T|E|R@1|U|P|T|I|B|L|E| +0#0000000&|U+0#e000002&|N|I|N|T|E|R@1|U|P|T|I|B|L|E| +0#0000000&@30
+> @74
+|(+0#0000e05&|*| |p|r|e|d|e|f|i|n|e|d| |t|y|p|e|s| |*|)| +0#0000000&@52
+|B+0#00e0003&|I|T|S|E|T| +0#0000000&|B+0#00e0003&|O@1|L|E|A|N| +0#0000000&|C+0#00e0003&|H|A|R| +0#0000000&|P+0#00e0003&|R|O|C| +0#0000000&|C+0#00e0003&|A|R|D|I|N|A|L| +0#0000000&|I+0#00e0003&|N|T|E|G|E|R| +0#0000000&|L+0#00e0003&|O|N|G|I|N|T| +0#0000000&|R+0#00e0003&|E|A|L| +0#0000000&|L+0#00e0003&|O|N|G|R|E|A|L| +0#0000000&@11
+|C+0#00e0003&|O|M|P|L|E|X| +0#0000000&|L+0#00e0003&|O|N|G|C|O|M|P|L|E|X| +0#0000000&|P+0#00e0003&|R|O|T|E|C|T|I|O|N| +0#0000000&@44
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+|A+0#00e0e07&|B|S| +0#0000000&|C+0#00e0e07&|H|R| +0#0000000&|C+0#00e0e07&|M|P|L|X| +0#0000000&|F+0#00e0e07&|L|O|A|T| +0#0000000&|H+0#00e0e07&|I|G|H| +0#0000000&|I+0#00e0e07&|M| +0#0000000&|I+0#00e0e07&|N|T| +0#0000000&|L+0#00e0e07&|E|N|G|T|H| +0#0000000&|L+0#00e0e07&|F|L|O|A|T| +0#0000000&|M+0#00e0e07&|A|X| +0#0000000&|M+0#00e0e07&|I|N| +0#0000000&|O+0#00e0e07&|D@1| +0#0000000&|O+0#00e0e07&|R|D| +0#0000000&|R+0#00e0e07&|E| +0#0000000&|S+0#00e0e07&|I|Z|E| +0#0000000&|T+0#00e0e07&|R|U|N|C
+| +0#0000000&|V+0#00e0e07&|A|L| +0#0000000&@70
+@75
+|(+0#0000e05&|*| |p|r|e|d|e|f|i|n|e|d| |m|a|c|r|o|s| |*|)| +0#0000000&@51
+|N+0#00e0e07&|E|W| +0#0000000&|D+0#00e0e07&|I|S|P|O|S|E| +0#0000000&@63
+@57|1|9|,|0|-|1| @7|1|3|%| 
diff --git a/runtime/syntax/testdir/dumps/modula2_iso_02.dump b/runtime/syntax/testdir/dumps/modula2_iso_02.dump
new file mode 100644
index 0000000..6d60233
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/modula2_iso_02.dump
@@ -0,0 +1,20 @@
+| +0&#ffffff0@74
+|(+0#0000e05&|*| |u|n|s|a|f|e| |b|u|i|l|t|i|n|s| |*|)| +0#0000000&@53
+|A+0#00e0003&|D@1|R|E|S@1| +0#0000000&|B+0#00e0003&|Y|T|E| +0#0000000&|L+0#00e0003&|O|C| +0#0000000&|W+0#00e0003&|O|R|D| +0#0000000&|A+0#00e0003&|D|R| +0#0000000&|C+0#00e0003&|A|S|T| +0#0000000&|T+0#00e0003&|S|I|Z|E| +0#0000000&|S+0#00e0003&|Y|S|T|E|M| +0#0000000&@31
+|M+0#00e0003&|A|K|E|A|D|R| +0#0000000&|A+0#00e0003&|D@1|A|D|R| +0#0000000&|S+0#00e0003&|U|B|A|D|R| +0#0000000&|D+0#00e0003&|I|F|A|D|R| +0#0000000&|R+0#00e0003&|O|T|A|T|E| +0#0000000&|S+0#00e0003&|H|I|F|T| +0#0000000&@33
+@75
+>(+0#0000e05&|*| |n|o|n|-|s|t|a|n|d|a|r|d| |l|a|n|g|u|a|g|e| |e|x|t|e|n|s|i|o|n|s| |*|)| +0#0000000&@36
+|L+0#00e0003&|O|N|G|C|A|R|D| +0#0000000&|L+0#00e0003&|O|N|G|B|I|T|S|E|T| +0#0000000&@55
+@75
+|(+0#0000e05&|*| |u|s|e|r| |d|e|f|i|n|e|d| |i|d|e|n|t|i|f|i|e|r|s| |*|)| +0#0000000&@44
+|f|o@1|b|a|r| |F|o@1|b|a|r| |F|o@1|B|a|r| |f|o@1|1|2|3| |f|o@1|_|b|a|r| @39
+@75
+|(+0#0000e05&|*| |s|t|r|i|n|g| |l|i|t|e|r|a|l|s| |*|)| +0#0000000&@53
+|s|t|r| |:+0#e000e06&|=| +0#0000000&|"+0#e000002&|f|o@1| |'|b|a|r|'| |b|a|z|"|;+0#e000e06&| +0#0000000&@51
+|s|t|r| |:+0#e000e06&|=| +0#0000000&|'+0#e000002&|f|o@1| |"|b|a|r|"| |b|a|z|'|;+0#e000e06&| +0#0000000&@51
+@75
+|(+0#0000e05&|*| |n|u|m|e|r|i|c| |l|i|t|e|r|a|l|s| |*|)| +0#0000000&@52
+|0+0#e000002&|F@2|H|,+0#e000e06&| +0#0000000&|1+0#e000002&|.|2|3|,+0#e000e06&| +0#0000000&|1+0#e000002&|.|2|3|e|-|4|5|,+0#e000e06&| +0#0000000&|1+0#e000002&|0@2| +0#0000000&@47
+@75
+|(+0#0000e05&|*| |o|c|t|a|l| |l|i|t|e|r|a|l|s| |*|)| +0#0000000&@54
+@57|3|7|,|1| @9|3|2|%| 
diff --git a/runtime/syntax/testdir/dumps/modula2_iso_03.dump b/runtime/syntax/testdir/dumps/modula2_iso_03.dump
new file mode 100644
index 0000000..b9406da
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/modula2_iso_03.dump
@@ -0,0 +1,20 @@
+|(+0#0000e05#ffffff0|*| |o|c|t|a|l| |l|i|t|e|r|a|l|s| |*|)| +0#0000000&@54
+|n| |:+0#e000e06&|=| +0#0000000&|0+0#e000002&|3|7@1|B|;+0#e000e06&| +0#0000000&|c|h| |:+0#e000e06&|=| +0#0000000&|0+0#e000002&|3|7@1|C|;+0#e000e06&| +0#0000000&@50
+@75
+|(+0#0000e05&|*| |p|r|a|g|m|a|s| |*|)| +0#0000000&@61
+|<+0#e000e06&|*|$|f|o@1|*|>| +0#0000000&@66
+> @74
+|(+0#0000e05&|*| |b|l|o|c|k| |c|o|m@1|e|n|t|s| |w|i|t|h| |e|m|p|h|a|s|i|s| |*|)| +0#0000000&@40
+|(+0#0000e05&|*| |c+0#e000e06&|o|p|y|r|i|g|h|t| +0#0000e05&|(|c|)| |J|u|r@1|a|s|i|c| |I|n|c|.| +0#0000000&@44
+| +0#0000e05&@2|a+0#e000e06&|u|t|h|o|r| +0#0000e05&|F|r|e|d| |F|l|i|n|t|s|t|o|n|e| |S|r|.| +0#0000000&@45
+| +0#0000e05&@2|l+0#e000e06&|i|c|e|n|s|e| +0#0000e05&|s|e@1| |L|I|C|E|N|S|E| |f|i|l|e|.| |*|)| +0#0000000&@43
+@75
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+| +0#0000e05&@2|p+0#e000e06&|o|s|t|-|c|o|n|d|i|t|i|o|n|s|:| +0#0000e05&|f|o@1|d|l|e| |b|a|b@1|l|e| |b|o|z|o| |b|i|m| |b|a|m| |d|a|n|g|.| +0#0000000&@22
+| +0#0000e05&@2|e+0#e000e06&|r@1|o|r|-|c|o|n|d|i|t|i|o|n|s|:| +0#0000e05&|d|a|d|a| |j|i|n|g|l|e| |j|u|n|g|l|e| |b|o|g@1|l|e| |d|e@1| |b|o@1|.| |*|)| +0#0000000&@16
+@75
+|(+0#0000e05&|*| |t|e|c|h|n|i|c|a|l| |d|e|b|t| |m|a|r|k|e|r|s| |*|)| +0#0000000&@46
+|(+0#0000e05&|*| |T+0#e000e06&|O|D|O|:| +0#0000e05&|.@2| |*|)| +0#0000000&@59
+|(+0#0000e05&|*| |F+0#e000e06&|I|X|M|E| +0#0000e05&|*|)| +0#0000000&@63
+|(+0#0000e05&|*| |D+0#e000e06&|E|P|R|E|C|A|T|E|D| +0#0000e05&|*|)| +0#0000000&@58
+@57|5@1|,|0|-|1| @7|5|1|%| 
diff --git a/runtime/syntax/testdir/dumps/modula2_iso_04.dump b/runtime/syntax/testdir/dumps/modula2_iso_04.dump
new file mode 100644
index 0000000..98fdc23
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/modula2_iso_04.dump
@@ -0,0 +1,20 @@
+|(+0#0000e05#ffffff0|*| |D+0#e000e06&|E|P|R|E|C|A|T|E|D| +0#0000e05&|*|)| +0#0000000&@58
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+|P+0#af5f00255&|R|O|C|E|D|U|R|E| +0#0000000&|N+0#00e0e07&|e|w|F|o@1|W|i|t|h|B|a|r| +0#0000000&|(+0#e000e06&| +0#0000000&|V+0#af5f00255&|A|R| +0#0000000&|f|o@1|:+0#e000e06&| +0#0000000&|F|o@1|;+0#e000e06&| +0#0000000&|b|a|r| |:+0#e000e06&| +0#0000000&|I+0#00e0003&|N|T|E|G|E|R| +0#0000000&|)+0#e000e06&|;| +0#0000000&@18
+|B+0#af5f00255&|E|G|I|N| +0#0000000&@69
+@2>N+0#00e0e07&|E|W|(+0#e000e06&|f+0#0000000&|o@1|)+0#e000e06&|;| +0#0000000&@63
+@2|f|o@1|^+0#e000e06&|.|b+0#0000000&|a|r| |:+0#e000e06&|=| +0#0000000&|b|a|r|;+0#e000e06&| +0#0000000&@56
+@2|R+0#af5f00255&|E|T|U|R|N| +0#0000000&@66
+|E+0#af5f00255&|N|D| +0#0000000&|S+0#00e0e07&|e|t|B|a|r|;+0#e000e06&| +0#0000000&@63
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+@2|E+0#af5f00255&|L|S|E| +0#0000000&@68
+@4|R+0#af5f00255&|E|T|U|R|N| +0#0000000&|f|o@1|^+0#e000e06&|.|b+0#0000000&|a|r| @55
+@2|E+0#af5f00255&|N|D| +0#0000000&|(+0#0000e05&|*| |I|F| |*|)| +0#0000000&@60
+|E+0#af5f00255&|N|D| +0#0000000&|b+0#00e0e07&|a|r|;+0#e000e06&| +0#0000000&@66
+@57|7|3|,|3| @9|7|0|%| 
diff --git a/runtime/syntax/testdir/dumps/modula2_iso_05.dump b/runtime/syntax/testdir/dumps/modula2_iso_05.dump
new file mode 100644
index 0000000..eca4631
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/modula2_iso_05.dump
@@ -0,0 +1,20 @@
+|E+0#af5f00255#ffffff0|N|D| +0#0000000&|b+0#00e0e07&|a|r|;+0#e000e06&| +0#0000000&@66
+@75
+|(+0#0000e05&|*| |d|i|s|a|b|l|e|d| |c|o|d|e| |*|)| +0#0000000&@55
+|?+0#4040ff13&|<| +0#0000000&@72
+|W+0#4040ff13&|H|I|L|E| |f|o@1| |=| |b|a|r| |D|O| +0#0000000&@56
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+|E+0#4040ff13&|N|D| |(|*| |W|H|I|L|E| |*|)|;| +0#0000000&@58
+|>+0#4040ff13&|?| +0#0000000&@72
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diff --git a/runtime/syntax/testdir/dumps/modula2_iso_06.dump b/runtime/syntax/testdir/dumps/modula2_iso_06.dump
new file mode 100644
index 0000000..4074a01
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diff --git a/runtime/syntax/testdir/dumps/modula2_iso_99.dump b/runtime/syntax/testdir/dumps/modula2_iso_99.dump
new file mode 100644
index 0000000..e23fb29
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diff --git a/runtime/syntax/testdir/dumps/modula2_pim_00.dump b/runtime/syntax/testdir/dumps/modula2_pim_00.dump
new file mode 100644
index 0000000..5e85b7a
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diff --git a/runtime/syntax/testdir/dumps/modula2_pim_01.dump b/runtime/syntax/testdir/dumps/modula2_pim_01.dump
new file mode 100644
index 0000000..8b93e0f
--- /dev/null
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diff --git a/runtime/syntax/testdir/dumps/modula2_pim_02.dump b/runtime/syntax/testdir/dumps/modula2_pim_02.dump
new file mode 100644
index 0000000..c417f84
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/modula2_pim_02.dump
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diff --git a/runtime/syntax/testdir/dumps/modula2_pim_03.dump b/runtime/syntax/testdir/dumps/modula2_pim_03.dump
new file mode 100644
index 0000000..d811245
--- /dev/null
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diff --git a/runtime/syntax/testdir/dumps/modula2_pim_04.dump b/runtime/syntax/testdir/dumps/modula2_pim_04.dump
new file mode 100644
index 0000000..7dc8514
--- /dev/null
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new file mode 100644
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new file mode 100644
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diff --git a/runtime/syntax/testdir/dumps/modula2_r10_04.dump b/runtime/syntax/testdir/dumps/modula2_r10_04.dump
new file mode 100644
index 0000000..cd6436c
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/modula2_r10_04.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/modula2_r10_05.dump b/runtime/syntax/testdir/dumps/modula2_r10_05.dump
new file mode 100644
index 0000000..2a8ae0c
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/modula2_r10_05.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/modula2_r10_06.dump b/runtime/syntax/testdir/dumps/modula2_r10_06.dump
new file mode 100644
index 0000000..68af55c
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/modula2_r10_06.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/modula2_r10_07.dump b/runtime/syntax/testdir/dumps/modula2_r10_07.dump
new file mode 100644
index 0000000..8f061fd
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/modula2_r10_07.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/modula2_r10_99.dump b/runtime/syntax/testdir/dumps/modula2_r10_99.dump
new file mode 100644
index 0000000..067fb47
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/modula2_r10_99.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/input/modula2_iso.def b/runtime/syntax/testdir/input/modula2_iso.def
new file mode 100644
index 0000000..b979ccf
--- /dev/null
+++ b/runtime/syntax/testdir/input/modula2_iso.def
@@ -0,0 +1,114 @@
+(* Modula-2 ISO Test File for Vim Syntax Colouring *)
+
+(* --------------------------------------------------
+ * THIS FILE IS LICENSED UNDER THE VIM LICENSE
+ * see https://github.com/vim/vim/blob/master/LICENSE
+ * -------------------------------------------------- *)
+
+
+DEFINITION MODULE Foobar; (*!m2iso*)
+
+FROM SYSTEM IMPORT LOC, WORD, ADDRESS;
+
+CONST MaxFoo = 1.0; LF = CHR(10);
+
+TYPE Foo = POINTER TO Bar;
+
+(* predefined constants *)
+FALSE NIL TRUE INTERRUPTIBLE UNINTERRUPTIBLE 
+
+(* predefined types *)
+BITSET BOOLEAN CHAR PROC CARDINAL INTEGER LONGINT REAL LONGREAL
+COMPLEX LONGCOMPLEX PROTECTION
+
+(* predefined procedures *)
+CAP DEC EXCL HALT INC INCL
+
+(* predefined functions *)
+ABS CHR CMPLX FLOAT HIGH IM INT LENGTH LFLOAT MAX MIN ODD ORD RE SIZE TRUNC VAL
+
+(* predefined macros *)
+NEW DISPOSE
+
+(* unsafe builtins *)
+ADDRESS BYTE LOC WORD ADR CAST TSIZE SYSTEM
+MAKEADR ADDADR SUBADR DIFADR ROTATE SHIFT
+
+(* non-standard language extensions *)
+LONGCARD LONGBITSET
+
+(* user defined identifiers *)
+foobar Foobar FooBar foo123 foo_bar
+
+(* string literals *)
+str := "foo 'bar' baz";
+str := 'foo "bar" baz';
+
+(* numeric literals *)
+0FFFH, 1.23, 1.23e-45, 1000
+
+(* octal literals *)
+n := 0377B; ch := 0377C;
+
+(* pragmas *)
+<*$foo*>
+
+(* block comments with emphasis *)
+(* copyright (c) Jurrasic Inc.
+   author Fred Flintstone Sr.
+   license see LICENSE file. *)
+
+(* pre-conditions: foo bar baz bam boo doodle wah.
+   post-conditions: foodle babble bozo bim bam dang.
+   error-conditions: dada jingle jungle boggle dee boo. *)
+
+(* technical debt markers *)
+(* TODO: ... *)
+(* FIXME *)
+(* DEPRECATED *)
+
+(* procedures *)
+PROCEDURE NewFooWithBar ( VAR foo: Foo; bar : INTEGER );
+BEGIN
+  NEW(foo);
+  foo^.bar := bar;
+  RETURN
+END SetBar;
+
+(* functions *)
+PROCEDURE bar ( foo : Foo ) : INTEGER;
+BEGIN
+  IF foo = NIL THEN
+    HALT
+  ELSE
+    RETURN foo^.bar
+  END (* IF *)
+END bar;
+  
+(* disabled code *)
+?<
+WHILE foo = bar DO
+  baz(bam, boo)
+END (* WHILE *);
+>?
+
+(* synonyms *)
+@  &  ~
+
+(* illegal characters *)
+`  !  $  %  \  ?  _
+
+(* illegal identifiers *)
+
+_bar  _bar_baz  _bar_baz__bam  _bar_baz__bam_boo
+
+bar_  bar_baz_  bar_baz__bam_  bar_baz__bam_boo_
+
+__bar  __bar_baz  __bar_baz__bam  __bar_baz__bam_boo
+
+bar__  bar_baz__  bar_baz__bam__  bar_baz__bam_boo__
+
+bar__baz  __bar_baz__  __bar__baz__  __
+
+
+END Foobar.
diff --git a/runtime/syntax/testdir/input/modula2_pim.def b/runtime/syntax/testdir/input/modula2_pim.def
new file mode 100644
index 0000000..e008160
--- /dev/null
+++ b/runtime/syntax/testdir/input/modula2_pim.def
@@ -0,0 +1,111 @@
+(* Modula-2 PIM Test File for Vim Syntax Colouring *)
+
+(* --------------------------------------------------
+ * THIS FILE IS LICENSED UNDER THE VIM LICENSE
+ * see https://github.com/vim/vim/blob/master/LICENSE
+ * -------------------------------------------------- *)
+
+DEFINITION MODULE Foobar; (*!m2pim*)
+
+FROM SYSTEM IMPORT WORD, ADDRESS;
+
+CONST MaxFoo = 1.0; LF = CHR(10);
+
+TYPE Foo = POINTER TO Bar;
+
+(* predefined constants *)
+FALSE NIL TRUE
+
+(* predefined types *)
+BITSET BOOLEAN CHAR PROC CARDINAL INTEGER LONGINT REAL LONGREAL
+
+(* predefined procedures *)
+CAP DEC EXCL HALT INC INCL
+
+(* predefined functions *)
+ABS CHR FLOAT HIGH MAX MIN ODD ORD SIZE TRUNC VAL
+
+(* predefined macros *)
+NEW DISPOSE
+
+(* unsafe builtins *)
+ADDRESS PROCESS WORD ADR TSIZE NEWPROCESS TRANSFER SYSTEM
+
+(* non-standard language extensions *)
+BYTE LONGCARD LONGBITSET
+
+(* user defined identifiers *)
+foobar Foobar FooBar foo123 foo_bar
+
+(* string literals *)
+str := "foo 'bar' baz";
+str := 'foo "bar" baz';
+
+(* numeric literals *)
+0FFFH, 1.23, 1.23e-45, 1000
+
+(* octal literals *)
+n := 0377B; ch := 0377C;
+
+(* pragmas *)
+(*$foo*)
+
+(* block comments with emphasis *)
+(* copyright (c) Jurrasic Inc.
+   author Fred Flintstone Sr.
+   license see LICENSE file. *)
+
+(* pre-conditions: foo bar baz bam boo doodle wah.
+   post-conditions: foodle babble bozo bim bam dang.
+   error-conditions: dada jingle jungle boggle dee boo. *)
+
+(* technical debt markers *)
+(* TODO: ... *)
+(* FIXME *)
+(* DEPRECATED *)
+
+(* procedures *)
+PROCEDURE NewFooWithBar ( VAR foo: Foo; bar : INTEGER );
+BEGIN
+  NEW(foo);
+  foo^.bar := bar;
+  RETURN
+END SetBar;
+
+(* functions *)
+PROCEDURE bar ( foo : Foo ) : INTEGER;
+BEGIN
+  IF foo = NIL THEN
+    HALT
+  ELSE
+    RETURN foo^.bar
+  END (* IF *)
+END bar;
+  
+(* disabled code *)
+?<
+WHILE foo = bar DO
+  baz(bam, boo)
+END (* WHILE *);
+>?
+
+(* synonyms *)
+&  ~
+
+(* illegal characters *)
+`  !  @  $  %  \  ?  _
+
+(* illegal identifiers *)
+
+_bar  _bar_baz  _bar_baz__bam  _bar_baz__bam_boo
+
+bar_  bar_baz_  bar_baz__bam_  bar_baz__bam_boo_
+
+__bar  __bar_baz  __bar_baz__bam  __bar_baz__bam_boo
+
+bar__  bar_baz__  bar_baz__bam__  bar_baz__bam_boo__
+
+bar__baz  __bar_baz__  __bar__baz__  __
+
+
+END Foobar.
diff --git a/runtime/syntax/testdir/input/modula2_r10.def b/runtime/syntax/testdir/input/modula2_r10.def
new file mode 100644
index 0000000..0872d5d
--- /dev/null
+++ b/runtime/syntax/testdir/input/modula2_r10.def
@@ -0,0 +1,146 @@
+(* Modula-2 R10 Test File for Vim Syntax Colouring *) 
+
+(* --------------------------------------------------
+ * THIS FILE IS LICENSED UNDER THE VIM LICENSE
+ * see https://github.com/vim/vim/blob/master/LICENSE
+ * -------------------------------------------------- *)
+
+DEFINITION MODULE Foobar; (*!m2r10*)
+
+IMPORT UNSAFE ALIAS BYTE, WORD, ADDRESS;
+
+CONST MaxFoo = 1.0;
+
+TYPE Foo = ALIAS OF Bar;
+
+(* predefined constants *)
+NIL FALSE TRUE
+
+(* predefined types *)
+BOOLEAN CHAR UNICHAR OCTET CARDINAL LONGCARD INTEGER LONGINT REAL LONGREAL
+
+(* predefined procedures *)
+APPEND INSERT REMOVE SORT SORTNEW
+
+(* predefined functions *)
+CHR ORD ODD ABS SGN MIN MAX LOG2 POW2 ENTIER PRED SUCC PTR CAPACITY COUNT LENGTH
+
+(* predefined macros *)
+NOP TMIN TMAX TSIZE TLIMIT
+
+(* unsafe builtins *)
+UNSAFE
+
+(* unsafe builtin types *)
+BYTE WORD LONGWORD ADDRESS OCTETSEQ
+
+(* unsafe builtin procedures *)
+ADD SUB DEC INC SETBIT HALT
+
+(* unsafe builtin functions *)
+ADR CAST BIT SHL SHR BWNOT BWAND BWOR
+
+(* non-portable language extensions *)
+ASSEMBLER ASM REG
+
+(* user defined identifiers *)
+foobar Foobar FooBar foo_bar foo0
+
+
+(* string literals *)
+str := "foo 'bar' baz";
+str := 'foo "bar" baz';
+
+(* numeric literals *)
+0b0110'0011'0110'0000, 0u0A, 0x0123, 0xCAFE'D00D
+1'000'000.00, 1.23, 1.23e+10, 1.234'567'890e-1'000
+
+
+(* language defined pragmas *)
+<*MSG=INFO:"foobar"*> <*ENCODING="UTF8"*> <*INLINE*> <*NOINLINE*> <*FFI="C"*>
+
+(* implementation defined pragmas *)
+<*GM2.Foobar|W=Bazbam*>
+
+
+(* single line comment *)
+! foo bar baz bam boo 
+
+(* block comments with emphasis *)
+(* copyright (c) 2016 Modula-2 Foundation.
+   authors B.Kowarsch and R.Sutcliffe
+   license see LICENSE *)
+
+(* pre-conditions: foo bar baz bam boo doodle wah.
+   post-conditions: foodle babble bozo bim bam dang.
+   error-conditions: dada jingle jungle boggle dee boo. *)
+
+(* (* *) *)
+
+(* bindings *)
+PROCEDURE [+] sum ( a, b : BCD ) : BCD;
+
+PROCEDURE [MOD] modulus ( n, m : INT64 ) : INT64;
+
+PROCEDURE [RETAIN] Retain ( foo : Foo );
+
+PROCEDURE [LENGTH] length ( str : String ) : LONGCARD;
+
+
+(* procedures *)
+PROCEDURE NewFooWithBar ( VAR foo: Foo; bar : INTEGER );
+BEGIN
+  NEW(foo);
+  foo^.bar := bar;
+  RETURN
+END NewFooWithBar;
+
+END END;
+
+(* functions *)
+PROCEDURE bar ( foo : Foo ) : INTEGER;
+BEGIN
+  IF foo = NIL THEN
+    UNSAFE.HALT
+  ELSE
+    RETURN foo^.bar
+  END (* IF *)
+END bar;
+
+
+(* technical debt *)
+TO DO ( 1234, Weight.Major ) (* foo *)
+  "redesign foo", 2d;
+  "replace foo", 2d;
+  "test new foo", 1d
+END (* TO DO *);
+
+PROCEDURE SetBaba <*DEPRECATED*> ( n : CARDINAL );
+
+  
+(* disabled code *)
+?<
+WHILE foo = bar DO
+  baz(bam, boo)
+END (* WHILE *);
+>?
+
+
+(* illegal characters *)
+`  ~  $  %  ?  _
+
+(* illegal identifiers *)
+
+_bar  _bar_baz  _bar_baz__bam  _bar_baz__bam_boo
+
+bar_  bar_baz_  bar_baz__bam_  bar_baz__bam_boo_
+
+__bar  __bar_baz  __bar_baz__bam  __bar_baz__bam_boo
+
+bar__  bar_baz__  bar_baz__bam__  bar_baz__bam_boo__
+
+bar__baz  __bar_baz__  __bar__baz__  __
+
+
+(* module end *)
+END Foobar.