if a variable that isn't in scope is used and main is not defined ghc freaks out
--y = 5::Double
f::Double ->Double
f x = x+y
--main = print 5
produces:
ghc: panic! (the 'impossible' happened)
(GHC version 8.0.2 for x86_64-unknown-linux):
initTc: unsolved constraints
WC {wc_insol = [W] y_axB :: t_axA[tau:1] (CHoleCan: y)}
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
un-commenting either line 1 or 4 causes ghc to identify the other problem correctly
Trac metadata
| Trac field | Value |
|---|---|
| Version | 8.4.3 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |