grammar WrongTranslation;

rule1 returns [ Object obj ]
: rule2 { $obj = $rule2.obj; }
| rule3 { $obj = $rule3.obj; }
| rule4 { $obj = $rule4.obj; }
;

rule2 returns [ Object obj ]
: foo='foo' { $obj = $foo.text; }
;

rule3 returns [ Object obj ]
: bar='bar' { $obj = $bar.text; }
;

rule4 returns [ Object obj ]
: baz='baz' { $obj = $baz.text; }
;


results in

 case 2 :
                    // /Users/kroepke/test/WrongTranslation.g:5:4: rule3
                    {
                    pushFollow(FOLLOW_rule3_in_rule122);
                    rule3();
                    _fsp--;

                     obj = $rule3.obj;

                    }
                    break;