Bogus multiple-declaration error in GHCi + Template Haskell

Try this (with ghc 7.8.3)

th% ghc --version
The Glorious Glasgow Haskell Compilation System, version 7.8.3
th $ ghc --interactive -XTemplateHaskell
GHCi, version 7.8.3: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Prelude> let x = True
Prelude> let y = [d| x = 'c' |]

<interactive>:3:13:
    Multiple declarations of ‘x’
    Declared at: <interactive>:2:5
                 <interactive>:3:13
    In the Template Haskell quotation [d| x = 'c' |]

This is obviously wrong, a failure of the name-shadwing code in RnNames.extendGlobalRdrEnvRn.

I suspect that this afflicts 7.10 too, but I can't check that right now.

Working on a fix.

Trac metadata

Trac field	Value
Version	7.8.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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