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duplicate "not in scope" error when giving multiple vars type-signatures at once

(bug in 6.6.1 and 6.7)

a, b :: Integer -> Tpyo
a = undefined
b = undefined

results in

gw.hs:2:19: Not in scope: type constructor or class `Tpyo'

gw.hs:2:19: Not in scope: type constructor or class `Tpyo'

Expected result: only one of the same error per location in file of mistake, not one per function being defined.

Trac metadata
Trac field Value
Version 6.6.1
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system Unknown
Architecture Unknown
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