the 'impossible' happened
$ cat bug.hs
foo = do let bad = [True | x <- [] | y <- []]
$ ghc bug.hs
[1 of 1] Compiling Main ( bug.hs, bug.o )
bug.hs:1:10:ghc: panic! (the 'impossible' happened)
(GHC version 7.4.1 for x86_64-apple-darwin):
Prelude.undefinedTrac metadata
| Trac field | Value |
|---|---|
| Version | 7.4.1 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |