#5515: panic! (the 'impossible' happened) with evil self-referential instance
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Reporter: andersk | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.3 | Keywords:
Testcase: | Blockedby:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: Compile-time crash
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Comment(by simonpj@…):
commit 817d1b047b538e408a8758a18270c51d429de670
{{{
Author: Simon Peyton Jones <[email protected]>
Date: Thu Sep 29 16:05:16 2011 +0100
Fix scoping for RHS of associated type decls (fixes Trac #5515)
We should not allow things like
class C a b where
type F a :: *
instance C (p,q) r where
type F (p,q) = r -- No! fvs(rhs) should be a subset
-- of fvs(lhs)
compiler/hsSyn/HsDecls.lhs | 11 ++++++++---
compiler/rename/RnSource.lhs | 42
++++++++++++++++++++++++++----------------
2 files changed, 34 insertions(+), 19 deletions(-)
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5515#comment:1>
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