Add an error production in `with' bindings to avoid a panic when a particularly ill-formed `with' binding is encountered.
Add an error production in `with' bindings to avoid a panic when a
particularly ill-formed `with' binding is encountered.

FranklinChen/Hugs,FranklinChen/Hugs,FranklinChen/Hugs,FranklinChen/Hugs,FranklinChen/Hugs,FranklinChen/Hugs,FranklinChen/Hugs