#5884: GHC panics while trying to derive a Generic instance for Complex a
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Reporter: mux | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.4.1 | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: Compile-time crash | Testcase:
Blockedby: | Blocking:
Related: |
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Comment(by mux):
I should have said that GHC crashes similarly, since the output I gave
shows that it was produced using GHCi (the "interpreted" bit). I initially
thought the two error messages were identical but there's a single letter
difference: ahY becomes ahZ. For the sake of completeness, here is the
error I get using ghc --make on the same test case with a dummy main
function:
{{{
[1 of 1] Compiling Main ( TestCase.hs, TestCase.o )
ghc: panic! (the 'impossible' happened)
(GHC version 7.4.1 for x86_64-unknown-freebsd):
tcTyVarDetails
( a{tv ahZ} [tv] :: ghc-prim:GHC.Prim.*{(w) tc 34d} )
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5884#comment:2>
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