#5970: Type checker hangs
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Reporter: Lemming | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler (Type checker) | Version: 7.4.1
Keywords: | Os: Linux
Architecture: x86 | Failure: Compile-time
performance bug
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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Comment(by simonpj@…):
commit 516d3138473d7b097cc572901bd02fce9509f1b8
{{{
Author: Simon Peyton Jones <[email protected]>
Date: Wed Mar 28 09:56:14 2012 +0100
Add a crucial forkM on the superclass context of IfaceClass in
tcIfaceDecl
The absence of this was causing a loop when typechecking an interface
where the superclass context mentioned an associated type
class C (T a) => D a where
data T a
Fixes Trac #5970
compiler/iface/BuildTyCl.lhs | 7 +++----
compiler/iface/LoadIface.lhs | 2 +-
compiler/iface/TcIface.lhs | 36
+++++++++++++++++++++++++-----------
compiler/typecheck/FamInst.lhs | 3 +++
4 files changed, 32 insertions(+), 16 deletions(-)
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5970#comment:4>
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