Error message should suggest UnboxedTuples language extension

If I compile this code:

module Foo where
import GHC.Integer

foo x y =
   case x `quotRemInteger` y of
    (# y, z #) -> 42

I get:

foo.hs:7:5: Parse error in pattern

It would be better if the error message suggested using -XUnboxedTuples.

Trac metadata

Trac field	Value
Version	6.9
Type	FeatureRequest
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (Parser)
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture