Cleanup highlighting for unused variables

Author: LnL7

syntax/elixir.vim

@@ -74,7 +74,7 @@ syn match elixirString "\(\w\)\@<!?\%(\\\(x\d{1,2}\|\h{1,2}\h\@!\>\|
 syn region elixirBlock matchgroup=elixirKeyword start="\<do\>\(:\)\@!" end="\<end\>" contains=ALLBUT,@elixirNotTop fold
 syn region elixirAnonymousFunction matchgroup=elixirKeyword start="\<fn\>" end="\<end\>" contains=ALLBUT,@elixirNotTop fold
 
-syn region elixirArguments start="(" end=")" contained contains=elixirOperator,elixirSymbol,elixirPseudoVariable,elixirName,elixirBoolean,elixirVariable,elixirUnusedVariable,exists,elixirNumber,elixirDocString,elixirSymbolInterpolated,elixirRegex,elixirRegexEscape,elixirRegexEscapePunctuation,elixirRegexCharClass,elixirRegexQuantifier,elixirSpecial,elixirString,elixirDelimiter
+syn region elixirArguments start="(" end=")" contained contains=elixirOperator,elixirSymbol,elixirPseudoVariable,elixirName,elixirBoolean,elixirVariable,elixirUnusedVariable,elixirNumber,elixirDocString,elixirSymbolInterpolated,elixirRegex,elixirRegexEscape,elixirRegexEscapePunctuation,elixirRegexCharClass,elixirRegexQuantifier,elixirSpecial,elixirString,elixirDelimiter
 
 syn match elixirDelimEscape "\\[(<{\[)>}\]]" transparent display contained contains=NONE