GADT definition not accepted in prefix notation

Brian Nguyen writes on haskell-cafe:

The following does not work:

data Foo a where {Foo :: (->) a (Foo a)}

Trac metadata

Trac field	Value
Version	7.8.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture

changed weight to 5

added Tbug Trac import labels

mentioned in commit 770e16fc

It's very much a corner case, but an easy merge to 7.8.3 so probably worth doing.

added 1 deleted label

changed milestone to %7.8.3

closed

Trac metadata

Trac field	Value
Resolution	Unresolved → ResolvedFixed

removed 1 deleted label

added Pnormal label

mentioned in issue #17211 (closed)

mentioned in commit 8b8dc366