Multiple constraint wildcards allowed with PartialTypeSignatures
The wiki states that
As a single extra-constraints wildcard is enough to infer any number of constraints, only one is allowed in a type signature and it should come last in the list of constraints.
However the following program compiles with GHC 7.10.1
{-# LANGUAGE PartialTypeSignatures #-}
f :: (Eq a, _, _) => a -> a -> Bool
f x y = x == y
Trac metadata
Trac field | Value |
---|---|
Version | 7.10.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | alanz |
Operating system | |
Architecture |