Multiple declaration error shown multiple times

Given the file:

foo = 1
a = ()
foo = 1
b = ()
foo = 1

You get the error message:

Uniplate.hs:3:0:
    Multiple declarations of `Main.foo'
    Declared at: Uniplate.hs:1:0
                 Uniplate.hs:3:0

Uniplate.hs:5:0:
    Multiple declarations of `Main.foo'
    Declared at: Uniplate.hs:1:0
                 Uniplate.hs:5:0

Instead of the much simpler:

Uniplate.hs:5:0:
    Multiple declarations of `Main.foo'
    Declared at: Uniplate.hs:1:0
                 Uniplate.hs:3:0
                 Uniplate.hs:5:0

This also happens with multiple class definitions, but if you give multiple type signatures then the error message is properly merged.

Trac metadata

Trac field	Value
Version	6.8.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
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Blocking
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Operating system	Unknown
Architecture	Unknown