#8383: "tagToEnum# (0# ==# 1#) :: Bool" causes CASEFAIL in ghci
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Reporter: rwbarton | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: GHCi | Version: 7.7
Resolution: | Keywords:
Operating System: Linux | Architecture: x86_64 (amd64)
Type of failure: None/Unknown | Difficulty: Unknown
Test Case: | Blocked By:
Blocking: | Related Tickets:
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Comment (by rwbarton):
It seems that the issue is in the bytecode generator for `tagToEnum#`,
which has been wrong since at least ghc 6.8.2 and probably since it was
added in 2001. However, an application of `tagToEnum#` to a constant
apparently gets constant-folded away before the interpreter sees it, which
is probably why nobody ever noticed before `tagToEnum#` became used in
derived Eq instances.
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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8383#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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