fix highlighting raw identifier

Author: rhysd

syntax/rust.vim

@@ -65,10 +65,11 @@ syn match   rustExternCrateString /".*"\_s*as/ contained nextgroup=rustIdentifie
 syn keyword   rustObsoleteExternMod mod contained nextgroup=rustIdentifier skipwhite skipempty
 
 syn match     rustIdentifier  contains=rustIdentifierPrime "\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*" display contained
-syn match     rustFuncName    "\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*" display contained
+syn match     rustFuncName    "\%(r#\)\=\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*" display contained
 
 syn region rustMacroRepeat matchgroup=rustMacroRepeatDelimiters start="$(" end="),\=[*+]" contains=TOP
 syn match rustMacroVariable "$\w\+"
+syn match rustRawIdent "\<r#\h\w*" contains=NONE
 
 " Reserved (but not yet used) keywords {{{2
 syn keyword   rustReservedKeyword become do priv typeof unsized abstract virtual final override