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  • Glasgow Haskell CompilerGlasgow Haskell Compiler
  • GHCGHC
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  • #10028
Closed
Open
Issue created Jan 26, 2015 by archaephyrryx@trac-archaephyrryx

GHC Panic (The Impossible Happened)

Error message:

ghc: panic! (the 'impossible' happened)
  (GHC version 7.4.1 for x86_64-unknown-linux):
	compiler/rename/RnPat.lhs:535:39-79: Irrefutable pattern failed for pattern gres@(gre : _)

Cause:

Importing a Module containing a record-syntax defined datatype, hiding one of the record fields, causes the use of the language pragma RecordWildCards to make GHC encounter a fatal error. A minimal reproduction case is attached to this ticket.

Trac metadata
Trac field Value
Version 7.4.1
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
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