#6096: tc126(optasm) is failing with a core lint error
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Reporter: igloo | Owner:
Type: bug | Status: new
Priority: high | Milestone: 7.6.1
Component: Compiler | Version: 7.5
Keywords: | Os: Unknown/Multiple
Architecture: Unknown/Multiple | Failure: GHC rejects valid program
Difficulty: Unknown | Testcase: tc126
Blockedby: | Blocking:
Related: |
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Comment(by simonpj@…):
commit ebcad7641a1e37e2e4abd7f513feb10c4ee458bc
{{{
Author: Simon Peyton Jones <[email protected]>
Date: Wed May 16 10:50:36 2012 +0100
When comparing Case expressions, take account of empty alternatives
After the recent change that allows empty case alternatives, we
were accidentally saying that these two were equal:
Case x _ Int []
Case x _ Bool []
Usually if the alternatives are equal so is the result type -- but
not if the alternatives are empty!
There are two places to fix:
CoreUtils.eqExpr
TrieMap with CoreExpr key
Fixes #6096, #6097
compiler/coreSyn/CoreUtils.lhs | 9 +++--
compiler/coreSyn/TrieMap.lhs | 60
++++++++++++++++++++++++++-------------
2 files changed, 45 insertions(+), 24 deletions(-)
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6096#comment:1>
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