#7384: Panic "ctEvTerm" when using functional dependencies and PolyKinds
------------------------------+---------------------------------------------
Reporter: goldfire | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.7 | Keywords: FunctionalDependencies
PolyKinds
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: None/Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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Comment(by simonpj@…):
commit 4dade857ec0b1655b6297191b9262eb5174eec87
{{{
Author: Simon Peyton Jones <simo...@microsoft.com>
Date: Tue Nov 6 16:03:11 2012 +0000
Make rewriteCtFlavor lazy in the coercion for Derived evidence
I think I accidentally introduced this bug a month ago when
refactoring. It's a bit non-obvious, but since Derived constraints
have no evidence, we mustn't be strict in it. Now there's a big
comment to prevent this bug happening again.
This fixes Trac #7384.
compiler/typecheck/TcSMonad.lhs | 66
++++++++++++++++++++++-----------------
1 files changed, 37 insertions(+), 29 deletions(-)
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7384#comment:2>
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