Fixed dot not being highlighted; identifiers no longer can be qualified

Author: maurges

syntax/haskell.vim

@@ -76,7 +76,7 @@ syn region haskellBrackets matchgroup=haskellDelimiter start="\[" end="]" contai
 syn region haskellBlock matchgroup=haskellDelimiter start="{" end="}" contains=TOP,@Spell
 syn keyword haskellInfix infix infixl infixr
 syn keyword haskellBottom undefined error
-syn match haskellOperators "\%([A-Z][a-zA-Z0-9_']*\.\)*[-!#$%&\*\+/<=>\?@\\^|~:]\+\|\<_\>\|\<\.\>"
+syn match haskellOperators "\%([A-Z][a-zA-Z0-9_']*\.\)*[-!#$%&\*\+/<=>\?@\\^|~:]\+\|\<_\>\|\k\@<!\.\|\.\k\@!"
 syn match haskellQuote "\<'\+" contained
 syn match haskellQuotedType "\%([A-Z][a-zA-Z0-9_']*\.\)*[A-Z][a-zA-Z0-9_']*\>" contained
 syn region haskellQuoted start="\<'\+" end="\>" skip="\."
@@ -95,7 +95,7 @@ syn match haskellLineComment "---*\([^-!#$%&\*\+./<=>\?@\\^|~].*\)\?$"
 syn match haskellBacktick "`[A-Za-z_][A-Za-z0-9_\.']*#\?`"
 syn region haskellString start=+"+ skip=+\\\\\|\\"+ end=+"+
   \ contains=@Spell
-syn match haskellIdentifier "\%([A-Z][a-zA-Z0-9_']*\.\)*[_a-z][a-zA-z0-9_']*" contained
+syn match haskellIdentifier "[_a-z][a-zA-z0-9_']*" contained
 syn match haskellChar "\<'[^'\\]'\|'\\.'\|'\\u[0-9a-fA-F]\{4}'\>"
 syn match haskellType "\<[A-Z][a-zA-Z0-9_']*\%(\.[A-Z][a-zA-Z0-9_']*\)*\.\@!\>"
 syn region haskellBlockComment start="{-" end="-}"