#5892: Compiler crash and other oddities when using RecordWildCards with record
accessors not imported
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Reporter: parcs | 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 simonpj@…):
commit 3e00d04619bb504e3cbe766eaf29e746d1211652
{{{
Author: Simon Peyton Jones <[email protected]>
Date: Sun Mar 4 09:41:52 2012 +0000
Fix Trac #5892: a coding errors
We had a lazy pattern
gres@(gre:_) = blah
and then a test for (null gres). But I'd forgotten
that a demand for *any* of variables in the pattern
matches *all* of the variables in the entire pattern.
So the test for (null gres) was matching the cons,
which defeats the purpose.
compiler/rename/RnPat.lhs | 8 ++++----
1 files changed, 4 insertions(+), 4 deletions(-)
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5892#comment:2>
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