[antlr-interest] unreachable code detected

[=?gb2312?q?=CB=EF=BC=CD=B8=D5=20Jigang=20(Robert)=20Sun?=]

The grammar is 
   
  type returns [int ty=0]
 : "int" LSQUARE RSQUARE {ty=INT_ARRAY_type;}
 | "int" {ty=INT_type;}
 | "boolean" {ty=BOOLEAN_type;}
 |  id:ID {ty=ID_type;}
   
  antlr generates
   public int  type() 
  {
  ....
    returnAST = type_AST;
  return ty;
  ASTPair.PutInstance(currentAST);
 }
   
  there is always a statement appears after return.
   
  Why?  
    

		
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