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---input---
constraint foo, bar {

  :name "myrule"
  rule (odd X) \ (even X) | true <=> fail.

}
rule. % not a kwd

---tokens---
'constraint'  Keyword.Declaration
' '           Text.Whitespace
'foo, bar '   Name.Function
'{'           Text
'\n\n  '      Text.Whitespace
':name'       Keyword.Mode
' '           Text.Whitespace
'"'           Literal.String.Double
'myrule'      Literal.String.Double
'"'           Literal.String.Double
'\n  '        Text.Whitespace
'rule'        Keyword.Declaration
' '           Text.Whitespace
'('           Text
'odd'         Text
' '           Text.Whitespace
'X'           Name.Variable
')'           Operator
' '           Text.Whitespace
'\\'          Keyword.Declaration
' '           Text.Whitespace
'('           Text
'even'        Text
' '           Text.Whitespace
'X'           Name.Variable
')'           Operator
' '           Text.Whitespace
'|'           Keyword.Declaration
' '           Text.Whitespace
'true'        Text
' '           Text.Whitespace
'<=>'         Keyword.Declaration
' '           Text.Whitespace
'fail'        Text
'.'           Operator
'\n\n'        Text.Whitespace

'}'           Text
'\n'          Text.Whitespace

'rule'        Text
'.'           Operator
' '           Text.Whitespace
'% not a kwd\n' Comment