Type synonyms not expanded consistently in errors

With this module:

type Foo = Int

x :: Char
x = f

f :: Foo
f = 5

GHC says:

g.hs:5:5:
    Couldn't match expected type `Char' with actual type `Int'
    Expected type: Char
      Actual type: Foo
    In the expression: f
    In an equation for `x': x = f

Note that the first line talks about Int, whereas the third line talks about Foo. I'd expect both to talk about Foo.

Trac metadata

Trac field	Value
Version	7.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (Type checker)
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