anchor.diff:      : ~('\'')*
       ;
   
  -SIMPLESTRINGLITERAL
  +STRING_LITERAL
       :   '"' StringPart '"'
       ;
   
  
positive.code:     )
      ;
  
  CHARLITERAL
      :   '`' ( ~ NonCharacterChars | EscapeSequence ) '`'
      ;
  
  
negative.code:     SPEC_EXPR;
      SPEC_STMT;
      SUPERCLASS;
      STATEMENT;
      TYPE_VARIANCE;
      TYPE_PARAMETER;
      STRING_CONCAT;
  }
  
  @parser::header { package com.redhat.ceylon.compiler.parser; }
  