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GHC 7.9 panics (simplifier ticks exhausted) on `half-0.2`
Compiling hackage:half-0.2 results in a GHC Panic:
$ ghc --version && ghc --print-project-git-commit-id
The Glorious Glasgow Haskell Compilation System, version 7.9.20141202
bf2d75417b5be7e8a79a26ee57a81e00682dabd4
$ cabal get half-0.2 && cd half-0.2/src/Numeric/
Unpacking to half-0.2/
$ ghc -Wall -O -fforce-recomp -c Half.hs
ghc: panic! (the 'impossible' happened)
(GHC version 7.9.20141202 for x86_64-unknown-linux):
Simplifier ticks exhausted
When trying UnfoldingDone lvl_s5yo
To increase the limit, use -fsimpl-tick-factor=N (default 100)
If you need to do this, let GHC HQ know, and what factor you needed
To see detailed counts use -ddump-simpl-stats
Total ticks: 125160
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.9 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | ekmett |
| Operating system | |
| Architecture |