diff --git a/runtime/syntax/cs.vim b/runtime/syntax/cs.vim
index 111bc85..116afe0 100644
--- a/runtime/syntax/cs.vim
+++ b/runtime/syntax/cs.vim
@@ -1,12 +1,12 @@
 " Vim syntax file
-" Language:		C#
-" Maintainer:		Nick Jensen <nickspoon@gmail.com>
-" Former Maintainer:	Anduin Withers <awithers@anduin.com>
-" Former Maintainer:	Johannes Zellner <johannes@zellner.org>
-" Last Change:		2018-05-02
-" Filenames:		*.cs
-" License:		Vim (see :h license)
-" Repository:		https://github.com/nickspoons/vim-cs
+" Language:            C#
+" Maintainer:          Nick Jensen <nickspoon@gmail.com>
+" Former Maintainers:  Anduin Withers <awithers@anduin.com>
+"                      Johannes Zellner <johannes@zellner.org>
+" Last Change:         2018-06-29
+" Filenames:           *.cs
+" License:             Vim (see :h license)
+" Repository:          https://github.com/nickspoons/vim-cs
 "
 " REFERENCES:
 " [1] ECMA TC39: C# Language Specification (WD13Oct01.doc)
@@ -19,146 +19,190 @@
 set cpo&vim
 
 
-syn keyword csType			bool byte char decimal double float int long object sbyte short string T uint ulong ushort var void dynamic
-syn keyword csStorage			delegate enum interface namespace struct
-syn keyword csRepeat			break continue do for foreach goto return while
-syn keyword csConditional		else if switch
-syn keyword csLabel			case default
-" there's no :: operator in C#
-syn match csOperatorError		display +::+
+syn keyword	csType	bool byte char decimal double float int long object sbyte short string T uint ulong ushort var void dynamic
+syn keyword	csStorage	delegate enum interface namespace struct
+syn keyword	csRepeat	break continue do for foreach goto return while
+syn keyword	csConditional	else if switch
+syn keyword	csLabel	case default
+syn match	csOperatorError	display +::+
+syn match	csGlobal	display +global::+
 " user labels (see [1] 8.6 Statements)
-syn match   csLabel			display +^\s*\I\i*\s*:\([^:]\)\@=+
-syn keyword csModifier			abstract const extern internal override private protected public readonly sealed static virtual volatile
-syn keyword csConstant			false null true
-syn keyword csException			try catch finally throw when
-syn keyword csLinq			ascending by descending equals from group in into join let on orderby select where
-syn keyword csAsync			async await
+syn match	csLabel	display +^\s*\I\i*\s*:\([^:]\)\@=+
+syn keyword	csModifier	abstract const extern internal override private protected public readonly sealed static virtual volatile
+syn keyword	csConstant	false null true
+syn keyword	csException	try catch finally throw when
+syn keyword	csLinq	ascending by descending equals from group in into join let on orderby select where
+syn keyword	csAsync	async await
 
-syn keyword csUnspecifiedStatement	as base checked event fixed get in is lock nameof operator out params ref set sizeof stackalloc this typeof unchecked unsafe using
-syn keyword csUnsupportedStatement	add remove value
-syn keyword csUnspecifiedKeyword	explicit implicit
+syn keyword	csUnspecifiedStatement	as base checked event fixed in is lock nameof operator out params ref sizeof stackalloc this typeof unchecked unsafe using
+syn keyword	csUnsupportedStatement	add remove value
+syn keyword	csUnspecifiedKeyword	explicit implicit
 
 " Contextual Keywords
-syn match csContextualStatement	/\<yield[[:space:]\n]\+\(return\|break\)/me=s+5
-syn match csContextualStatement	/\<partial[[:space:]\n]\+\(class\|struct\|interface\)/me=s+7
-syn match csContextualStatement	/\<\(get\|set\)[[:space:]\n]*{/me=s+3
-syn match csContextualStatement	/\<where\>[^:]\+:/me=s+5
+syn match	csContextualStatement	/\<yield[[:space:]\n]\+\(return\|break\)/me=s+5
+syn match	csContextualStatement	/\<partial[[:space:]\n]\+\(class\|struct\|interface\)/me=s+7
+syn match	csContextualStatement	/\<\(get\|set\)\(;\|[[:space:]\n]*{\)/me=s+3
+syn match	csContextualStatement	/\<where\>[^:]\+:/me=s+5
+
+" Punctuation
+syn match	csBraces	"[{}\[\]]" display
+syn match	csParens	"[()]" display
+syn match	csOpSymbols	"[+\-><=]\{1,2}" display
+syn match	csOpSymbols	"[!><+\-*/]=" display
+syn match	csOpSymbols	"[!*/^]" display
+syn match	csOpSymbols	"=>" display
+syn match	csEndColon	";" display
+syn match	csLogicSymbols	"&&" display
+syn match	csLogicSymbols	"||" display
+syn match	csLogicSymbols	"?" display
+syn match	csLogicSymbols	":" display
 
 " Comments
 "
 " PROVIDES: @csCommentHook
-"
-" TODO: include strings ?
-"
-syn keyword csTodo		contained TODO FIXME XXX NOTE HACK
-syn region  csComment		start="/\*"  end="\*/" contains=@csCommentHook,csTodo,@Spell
-syn match   csComment		"//.*$" contains=@csCommentHook,csTodo,@Spell
+syn keyword	csTodo	contained TODO FIXME XXX NOTE HACK TBD
+syn region	csComment	start="/\*"  end="\*/" contains=@csCommentHook,csTodo,@Spell
+syn match	csComment	"//.*$" contains=@csCommentHook,csTodo,@Spell
 
 " xml markup inside '///' comments
-syn cluster xmlRegionHook	add=csXmlCommentLeader
-syn cluster xmlCdataHook	add=csXmlCommentLeader
-syn cluster xmlStartTagHook	add=csXmlCommentLeader
-syn keyword csXmlTag		contained Libraries Packages Types Excluded ExcludedTypeName ExcludedLibraryName
-syn keyword csXmlTag		contained ExcludedBucketName TypeExcluded Type TypeKind TypeSignature AssemblyInfo
-syn keyword csXmlTag		contained AssemblyName AssemblyPublicKey AssemblyVersion AssemblyCulture Base
-syn keyword csXmlTag		contained BaseTypeName Interfaces Interface InterfaceName Attributes Attribute
-syn keyword csXmlTag		contained AttributeName Members Member MemberSignature MemberType MemberValue
-syn keyword csXmlTag		contained ReturnValue ReturnType Parameters Parameter MemberOfPackage
-syn keyword csXmlTag		contained ThreadingSafetyStatement Docs devdoc example overload remarks returns summary
-syn keyword csXmlTag		contained threadsafe value internalonly nodoc exception param permission platnote
-syn keyword csXmlTag		contained seealso b c i pre sub sup block code note paramref see subscript superscript
-syn keyword csXmlTag		contained list listheader item term description altcompliant altmember
+syn cluster	xmlRegionHook	add=csXmlCommentLeader
+syn cluster	xmlCdataHook	add=csXmlCommentLeader
+syn cluster	xmlStartTagHook	add=csXmlCommentLeader
+syn keyword	csXmlTag	contained Libraries Packages Types Excluded ExcludedTypeName ExcludedLibraryName
+syn keyword	csXmlTag	contained ExcludedBucketName TypeExcluded Type TypeKind TypeSignature AssemblyInfo
+syn keyword	csXmlTag	contained AssemblyName AssemblyPublicKey AssemblyVersion AssemblyCulture Base
+syn keyword	csXmlTag	contained BaseTypeName Interfaces Interface InterfaceName Attributes Attribute
+syn keyword	csXmlTag	contained AttributeName Members Member MemberSignature MemberType MemberValue
+syn keyword	csXmlTag	contained ReturnValue ReturnType Parameters Parameter MemberOfPackage
+syn keyword	csXmlTag	contained ThreadingSafetyStatement Docs devdoc example overload remarks returns summary
+syn keyword	csXmlTag	contained threadsafe value internalonly nodoc exception param permission platnote
+syn keyword	csXmlTag	contained seealso b c i pre sub sup block code note paramref see subscript superscript
+syn keyword	csXmlTag	contained list listheader item term description altcompliant altmember
 
 syn cluster xmlTagHook add=csXmlTag
 
-syn match   csXmlCommentLeader	+\/\/\/+    contained
-syn match   csXmlComment	+\/\/\/.*$+ contains=csXmlCommentLeader,@csXml,@Spell
-syntax include @csXml syntax/xml.vim
-hi def link xmlRegion Comment
+syn match	csXmlCommentLeader	+\/\/\/+    contained
+syn match	csXmlComment	+\/\/\/.*$+ contains=csXmlCommentLeader,@csXml,@Spell
+syn include	@csXml syntax/xml.vim
+hi def link	xmlRegion Comment
 
 
 " [1] 9.5 Pre-processing directives
-syn region	csPreCondit
-    \ start="^\s*#\s*\(define\|undef\|if\|elif\|else\|endif\|line\|error\|warning\)"
-    \ skip="\\$" end="$" contains=csComment keepend
-syn region	csRegion matchgroup=csPreCondit start="^\s*#\s*region.*$"
-    \ end="^\s*#\s*endregion" transparent fold contains=TOP
-syn region	csSummary start="^\s*/// <summary" end="^\(\s*///\)\@!" transparent fold keepend
+syn region	csPreCondit	start="^\s*#\s*\(define\|undef\|if\|elif\|else\|endif\|line\|error\|warning\)" skip="\\$" end="$" contains=csComment keepend
+syn region	csRegion	matchgroup=csPreCondit start="^\s*#\s*region.*$" end="^\s*#\s*endregion" transparent fold contains=TOP
+syn region	csSummary	start="^\s*/// <summary" end="^\%\(\s*///\)\@!" transparent fold keepend
 
 
-syn region	csClassType start="\(@\)\@<!class\>"hs=s+6 end="[:\n{]"he=e-1 contains=csClass
-syn region	csNewType start="\(@\)\@<!new\>"hs=s+4 end="[\(\<{\[]"he=e-1 contains=csNew contains=csNewType
-syn region	csIsType start="\v (is|as) "hs=s+4 end="\v[A-Za-z0-9]+" oneline contains=csIsAs
-syn keyword	csNew new contained
-syn keyword	csClass class contained
-syn keyword	csIsAs is as
+syn region	csClassType	start="@\@1<!\<class\>"hs=s+6 end="[:\n{]"me=e-1 contains=csClass
+syn region	csNewType	start="@\@1<!\<new\>"hs=s+4 end="[;\n{(<\[]"me=e-1 contains=csNew contains=csNewType
+syn region	csIsType	start=" is "hs=s+4 end="[A-Za-z0-9]\+" oneline contains=csIsAs
+syn region	csIsType	start=" as "hs=s+4 end="[A-Za-z0-9]\+" oneline contains=csIsAs
+syn keyword	csNew	new contained
+syn keyword	csClass	class contained
+syn keyword	csIsAs	is as
 
 " Strings and constants
-syn match   csSpecialError	contained "\\."
-syn match   csSpecialCharError	contained "[^']"
+syn match	csSpecialError	"\\." contained
+syn match	csSpecialCharError	"[^']" contained
 " [1] 9.4.4.4 Character literals
-syn match   csSpecialChar	contained +\\["\\'0abfnrtvx]+
-" unicode characters
-syn match   csUnicodeNumber	+\\\(u\x\{4}\|U\x\{8}\)+ contained contains=csUnicodeSpecifier
-syn match   csUnicodeSpecifier	+\\[uU]+ contained
-syn region  csVerbatimString	start=+@"+ end=+"+ skip=+""+ contains=csVerbatimSpec,@Spell
-syn match   csVerbatimSpec	+@"+he=s+1 contained
-syn region  csString		start=+"+  end=+"+ end=+$+ contains=csSpecialChar,csSpecialError,csUnicodeNumber,@Spell
-syn match   csCharacter		"'[^']*'" contains=csSpecialChar,csSpecialCharError
-syn match   csCharacter		"'\\''" contains=csSpecialChar
-syn match   csCharacter		"'[^\\]'"
-syn match   csNumber		"\<\(0[0-7]*\|0[xX]\x\+\|\d\+\)[lL]\=\>"
-syn match   csNumber		"\(\<\d\+\.\d*\|\.\d\+\)\([eE][-+]\=\d\+\)\=[fFdD]\="
-syn match   csNumber		"\<\d\+[eE][-+]\=\d\+[fFdD]\=\>"
-syn match   csNumber		"\<\d\+\([eE][-+]\=\d\+\)\=[fFdD]\>"
+syn match	csSpecialChar	+\\["\\'0abfnrtvx]+ contained display
+syn match	csUnicodeNumber	+\\u\x\{4}+ contained contains=csUnicodeSpecifier display
+syn match	csUnicodeNumber	+\\U\x\{8}+ contained contains=csUnicodeSpecifier display
+syn match	csUnicodeSpecifier	+\\[uU]+ contained display
+
+syn region	csString	matchgroup=csQuote start=+"+  end=+"+ end=+$+ extend contains=csSpecialChar,csSpecialError,csUnicodeNumber,@Spell
+syn match	csCharacter	"'[^']*'" contains=csSpecialChar,csSpecialCharError display
+syn match	csCharacter	"'\\''" contains=csSpecialChar display
+syn match	csCharacter	"'[^\\]'" display
+syn match	csNumber	"\<0[0-7]*[lL]\=\>" display
+syn match	csNumber	"\<0[xX]\x\+[lL]\=\>" display
+syn match	csNumber	"\<\d\+[lL]\=\>" display
+syn match	csNumber	"\<\d\+\.\d*\%\([eE][-+]\=\d\+\)\=[fFdD]\=" display
+syn match	csNumber	"\.\d\+\%\([eE][-+]\=\d\+\)\=[fFdD]\=" display
+syn match	csNumber	"\<\d\+[eE][-+]\=\d\+[fFdD]\=\>" display
+syn match	csNumber	"\<\d\+\%\([eE][-+]\=\d\+\)\=[fFdD]\>" display
+
+syn region	csInterpolatedString	matchgroup=csQuote start=+\$"+ end=+"+ end=+$+ extend contains=csInterpolation,csEscapedInterpolation,csSpecialChar,csSpecialError,csUnicodeNumber,@Spell
+
+syn region	csInterpolation	matchgroup=csInterpolationDelimiter start=+{+ end=+}+ keepend contained contains=@csAll,csBracketed,csInterpolationAlign,csInterpolationFormat
+syn match	csEscapedInterpolation	"{{" transparent contains=NONE display
+syn match	csEscapedInterpolation	"}}" transparent contains=NONE display
+syn region	csInterpolationAlign	matchgroup=csInterpolationAlignDel start=+,+ end=+}+ end=+:+me=e-1 contained contains=csNumber,csConstant,csCharacter,csParens,csOpSymbols,csString,csBracketed display
+syn match	csInterpolationFormat	+:[^}]\+}+ contained contains=csInterpolationFormatDel display
+syn match	csInterpolationAlignDel	+,+ contained display
+syn match	csInterpolationFormatDel	+:+ contained display
+
+syn region	csVerbatimString	matchgroup=csQuote start=+@"+ end=+"+ skip=+""+ extend contains=csVerbatimQuote,@Spell
+syn match	csVerbatimQuote	+""+ contained
+syn match	csQuoteError	+@$"+he=s+2,me=s+2
+
+syn region	csInterVerbString	matchgroup=csQuote start=+\$@"+ end=+"+ skip=+""+ extend contains=csInterpolation,csEscapedInterpolation,csSpecialChar,csSpecialError,csUnicodeNumber,csVerbatimQuote,@Spell
+
+syn region	csBracketed	matchgroup=csParens start=+(+ end=+)+ contained transparent contains=@csAll,csBracketed
+
+syn cluster	csAll	contains=csCharacter,csClassType,csComment,csContextualStatement,csEndColon,csInterpolatedString,csIsType,csLabel,csLogicSymbols,csNewType,csConstant,csNumber,csOpSymbols,csOperatorError,csParens,csPreCondit,csRegion,csString,csSummary,csUnicodeNumber,csUnicodeSpecifier,csVerbatimString
 
 " The default highlighting.
-hi def link csType			Type
-hi def link csNewType			Type
-hi def link csClassType			Type
-hi def link csIsType			Type
-hi def link csStorage			StorageClass
-hi def link csClass			StorageClass
-hi def link csRepeat			Repeat
-hi def link csConditional		Conditional
-hi def link csLabel			Label
-hi def link csModifier			StorageClass
-hi def link csConstant			Constant
-hi def link csException			Exception
-hi def link csUnspecifiedStatement	Statement
-hi def link csUnsupportedStatement	Statement
-hi def link csUnspecifiedKeyword	Keyword
-hi def link csNew			Statement
-hi def link csLinq			Statement
-hi def link csIsAs 			Keyword
-hi def link csAsync			Keyword
-hi def link csContextualStatement	Statement
-hi def link csOperatorError		Error
-hi def link csInterfaceDeclaration	Include
+hi def link	csType	Type
+hi def link	csNewType	Type
+hi def link	csClassType	Type
+hi def link	csIsType	Type
+hi def link	csStorage	StorageClass
+hi def link	csClass	StorageClass
+hi def link	csRepeat	Repeat
+hi def link	csConditional	Conditional
+hi def link	csLabel	Label
+hi def link	csModifier	StorageClass
+hi def link	csConstant	Constant
+hi def link	csException	Exception
+hi def link	csUnspecifiedStatement	Statement
+hi def link	csUnsupportedStatement	Statement
+hi def link	csUnspecifiedKeyword	Keyword
+hi def link	csNew	Statement
+hi def link	csLinq	Statement
+hi def link	csIsAs 	Keyword
+hi def link	csAsync	Keyword
+hi def link	csContextualStatement	Statement
+hi def link	csOperatorError	Error
+hi def link	csInterfaceDeclaration	Include
 
-hi def link csTodo			Todo
-hi def link csComment			Comment
+hi def link	csTodo	Todo
+hi def link	csComment	Comment
 
-hi def link csSpecialError		Error
-hi def link csSpecialCharError		Error
-hi def link csString			String
-hi def link csVerbatimString		String
-hi def link csVerbatimSpec		SpecialChar
-hi def link csPreCondit			PreCondit
-hi def link csCharacter			Character
-hi def link csSpecialChar		SpecialChar
-hi def link csNumber			Number
-hi def link csUnicodeNumber		SpecialChar
-hi def link csUnicodeSpecifier		SpecialChar
+hi def link	csEndColon	Statement
+hi def link	csOpSymbols	Operator
+hi def link	csLogicSymbols	Boolean
+hi def link	csBraces	Function
+hi def link	csParens	Operator
+
+hi def link	csSpecialError	Error
+hi def link	csSpecialCharError	Error
+hi def link	csString	String
+hi def link	csQuote	String
+hi def link	csQuoteError	Error
+hi def link	csInterpolatedString	String
+hi def link	csVerbatimString	String
+hi def link	csInterVerbString	String
+hi def link	csVerbatimQuote	SpecialChar
+hi def link	csPreCondit	PreCondit
+hi def link	csCharacter	Character
+hi def link	csSpecialChar	SpecialChar
+hi def link	csNumber	Number
+hi def link	csUnicodeNumber	SpecialChar
+hi def link	csUnicodeSpecifier	SpecialChar
+hi def link	csInterpolationDelimiter	Delimiter
+hi def link	csInterpolationAlignDel	csInterpolationDelimiter
+hi def link	csInterpolationFormat	csInterpolationDelimiter
+hi def link	csInterpolationFormatDel	csInterpolationDelimiter
 
 " xml markup
-hi def link csXmlCommentLeader		Comment
-hi def link csXmlComment		Comment
-hi def link csXmlTag			Statement
+hi def link	csXmlCommentLeader	Comment
+hi def link	csXmlComment	Comment
+hi def link	csXmlTag	Statement
 
 let b:current_syntax = "cs"
 
 let &cpo = s:cs_cpo_save
 unlet s:cs_cpo_save
 
-" vim: ts=8
+" vim: vts=16,28