Update runtime files.
diff --git a/runtime/syntax/sexplib.vim b/runtime/syntax/sexplib.vim
new file mode 100644
index 0000000..55dd3fb
--- /dev/null
+++ b/runtime/syntax/sexplib.vim
@@ -0,0 +1,88 @@
+" Vim syntax file
+" Language: S-expressions as used in Sexplib
+" Filenames: *.sexp
+" Maintainers: Markus Mottl <markus.mottl@gmail.com>
+" URL: https://github.com/ocaml/vim-ocaml
+" Last Change: 2020 Dec 31 - Updated header for Vim contribution (MM)
+" 2017 Apr 11 - Improved matching of negative numbers (MM)
+" 2012 Jun 20 - Fixed a block comment highlighting bug (MM)
+
+" For version 5.x: Clear all syntax items
+" For version 6.x: Quit when a syntax file was already loaded
+if version < 600
+ syntax clear
+elseif exists("b:current_syntax") && b:current_syntax == "sexplib"
+ finish
+endif
+
+" Sexplib is case sensitive.
+syn case match
+
+" Comments
+syn keyword sexplibTodo contained TODO FIXME XXX NOTE
+syn region sexplibBlockComment matchgroup=sexplibComment start="#|" matchgroup=sexplibComment end="|#" contains=ALLBUT,sexplibQuotedAtom,sexplibUnquotedAtom,sexplibEncl,sexplibComment
+syn match sexplibSexpComment "#;" skipwhite skipempty nextgroup=sexplibQuotedAtomComment,sexplibUnquotedAtomComment,sexplibListComment,sexplibComment
+syn region sexplibQuotedAtomComment start=+"+ skip=+\\\\\|\\"+ end=+"+ contained
+syn match sexplibUnquotedAtomComment /\([^;()" \t#|]\|#[^;()" \t|]\||[^;()" \t#]\)[^;()" \t]*/ contained
+syn region sexplibListComment matchgroup=sexplibComment start="(" matchgroup=sexplibComment end=")" contained contains=ALLBUT,sexplibEncl,sexplibString,sexplibQuotedAtom,sexplibUnquotedAtom,sexplibTodo,sexplibNumber,sexplibFloat
+syn match sexplibComment ";.*" contains=sexplibTodo
+
+" Atoms
+syn match sexplibUnquotedAtom /\([^;()" \t#|]\|#[^;()" \t|]\||[^;()" \t#]\)[^;()" \t]*/
+syn region sexplibQuotedAtom start=+"+ skip=+\\\\\|\\"+ end=+"+
+syn match sexplibNumber "-\=\<\d\(_\|\d\)*[l|L|n]\?\>"
+syn match sexplibNumber "-\=\<0[x|X]\(\x\|_\)\+[l|L|n]\?\>"
+syn match sexplibNumber "-\=\<0[o|O]\(\o\|_\)\+[l|L|n]\?\>"
+syn match sexplibNumber "-\=\<0[b|B]\([01]\|_\)\+[l|L|n]\?\>"
+syn match sexplibFloat "-\=\<\d\(_\|\d\)*\.\?\(_\|\d\)*\([eE][-+]\=\d\(_\|\d\)*\)\=\>"
+
+" Lists
+syn region sexplibEncl transparent matchgroup=sexplibEncl start="(" matchgroup=sexplibEncl end=")" contains=ALLBUT,sexplibParenErr
+
+" Errors
+syn match sexplibUnquotedAtomErr /\([^;()" \t#|]\|#[^;()" \t|]\||[^;()" \t#]\)[^;()" \t]*\(#|\||#\)[^;()" \t]*/
+syn match sexplibParenErr ")"
+
+" Synchronization
+syn sync minlines=50
+syn sync maxlines=500
+
+" Define the default highlighting.
+" For version 5.7 and earlier: only when not done already
+" For version 5.8 and later: only when an item doesn't have highlighting yet
+if version >= 508 || !exists("did_sexplib_syntax_inits")
+ if version < 508
+ let did_sexplib_syntax_inits = 1
+ command -nargs=+ HiLink hi link <args>
+ else
+ command -nargs=+ HiLink hi def link <args>
+ endif
+
+ HiLink sexplibParenErr Error
+ HiLink sexplibUnquotedAtomErr Error
+
+ HiLink sexplibComment Comment
+ HiLink sexplibSexpComment Comment
+ HiLink sexplibQuotedAtomComment Include
+ HiLink sexplibUnquotedAtomComment Comment
+ HiLink sexplibBlockComment Comment
+ HiLink sexplibListComment Comment
+
+ HiLink sexplibBoolean Boolean
+ HiLink sexplibCharacter Character
+ HiLink sexplibNumber Number
+ HiLink sexplibFloat Float
+ HiLink sexplibUnquotedAtom Identifier
+ HiLink sexplibEncl Identifier
+ HiLink sexplibQuotedAtom Keyword
+
+ HiLink sexplibTodo Todo
+
+ HiLink sexplibEncl Keyword
+
+ delcommand HiLink
+endif
+
+let b:current_syntax = "sexplib"
+
+" vim: ts=8