* parse.y (stmt): explicit error for "Object::Far += foo 1" just

  as "Object::Far += 1".

git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@21520 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 5 insertions, 0 deletions

diff --git a/parse.y b/parse.y
index 42d24f61d..2074cb673 100644
--- a/parse.y
+++ b/parse.y
@@ -1100,6 +1100,11 @@ stmt		: keyword_alias fitem {lex_state = EXPR_FNAME;} fitem
 			$$ = dispatch3(opassign, $$, $4, $5);
 		    %*/
 		    }
+		| primary_value tCOLON2 tCONSTANT tOP_ASGN command_call
+		    {
+			yyerror("constant re-assignment");
+			$$ = 0;
+		    }
 		| primary_value tCOLON2 tIDENTIFIER tOP_ASGN command_call
 		    {
 		    /*%%%*/