Opened 8 years ago

Closed 8 years ago

Last modified 8 years ago

#2481 closed bug (fixed)

ghci: :f fmap -> can't unify

Reported by: guest Owned by:
Priority: normal Milestone: 6.10.1
Component: GHCi Version: 6.8.2
Keywords: Cc: vincent@…
Operating System: Linux Architecture: x86_64 (amd64)
Type of failure: Test Case:
Blocked By: Blocking:
Related Tickets: Differential Rev(s):
Wiki Page:


Typing ':f fmap' at the GHCi prompt gives a panic (Can't unify). See below:

$ ghci
GHCi, version 6.8.2:  :? for help
Loading package base ... linking ... done.
Prelude> :f fmap
ghc-6.8.2: panic! (the 'impossible' happened)
  (GHC version 6.8.2 for x86_64-unknown-linux):
	Can't unify

Please report this as a GHC bug:


This is with the ghc package distributed with Debian testing/lenny (version 6.8.2-5).


Change History (2)

comment:1 Changed 8 years ago by igloo

  • difficulty set to Unknown
  • Resolution set to fixed
  • Status changed from new to closed

Thanks for the report. Happily, this already works in the HEAD:

Prelude> :f fmap
fmap = _

comment:2 Changed 8 years ago by igloo

  • Milestone set to 6.10.1
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