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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