#1781: Type equality class leads to non-termination
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Reporter: chak | Owner:
Type: bug | Status: new
Priority: normal | Milestone: 6.8.1
Component: Compiler (Type checker) | Version: 6.9
Severity: blocker | Resolution:
Keywords: | Difficulty: Unknown
Os: Unknown | Testcase:
Architecture: Unknown |
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Changes (by guest):
* cc: [EMAIL PROTECTED] (added)
* severity: normal => blocker
* milestone: => 6.8.1
Comment:
I set the milestone to 6.8.1 and the severity to blocker, and I hope for
your understanding. The reason is that at the moment it seems to be
impossible to implement a HList-like equality test. At some point you
need a type equality constraint, either {{{t1 ~ t2}}} or {{{E t1 t2}}}
(with {{{E}}} being defined as above). But neither of them works! The
latter doesn’t work because of this very bug, the former doesn’t work
probably because of bug #1754. So if GHC 6.8.1 is released without this
bug being fixed I’ll probably have to tell my users (of Grapefruit) that
they need something like GHC 6.8.0.20070916. :-(
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1781#comment:2>
GHC <http://www.haskell.org/ghc/>
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