Code using seq has wrong strictness when unoptimised (too strict)
The following piece of code gets miscompiled if no optimisation is used. The program crashes instead of printing [0], which would be the correct behaviour. GHC 7.3.20111127 has been used for triggering this bug.
test = seq (seq id (\a -> undefined a))
main = do
print $ test [0]Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.3 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | michal.palka@poczta.fm |
| Operating system | |
| Architecture |