anchor.diff:      IS_EXPR;
       SATISFIES_EXPR;
       SPECIAL_ARG;
  -    //PRIMARY;
  +    PRIMARY;
   }
   
   @parser::header { package com.redhat.ceylon.compiler.parser; }
  
positive.code:     
  primary
      : base selector*
      -> ^(EXPR base selector*)
      ;
  
  postfixOperator
  
negative.code:     ;
  
  memberDeclaration
      : memberHeader
      ( 
        memberParameters memberDefinition
      -> ^(METHOD_DECL memberHeader memberParameters memberDefinition?)
      | memberDefinition 
      -> ^(ATTRIBUTE_DECL memberHeader memberDefinition?)
      )
      ;
  
  memberHeader
      : memberType memberName
      -> ^(MEMBER_TYPE memberType) memberName
      | 'assign' memberName
      -> ^(ATTRIBUTE_SETTER) memberName
      ;
  
  memberType
  