#4099: Slighlty confusing error message with data families
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Reporter: rl | Owner:
Type: bug | Status: closed
Priority: normal | Milestone:
Component: Compiler | Version: 6.13
Resolution: fixed | Keywords:
Difficulty: | Os:
Unknown/Multiple
Testcase: indexed-types/should_fail/T4099 | Architecture:
Unknown/Multiple
Failure: None/Unknown |
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Changes (by simonpj):
* status: new => closed
* testcase: => indexed-types/should_fail/T4099
* resolution: => fixed
Comment:
Yes good point. Fixed by
{{{
Mon May 31 15:04:13 BST 2010 [email protected]
* Fix Trac #4099: better error message for type functions
Now we only want about "T is a type function and might not be
injective" when matchin (T x) against (T y), which is the case
that is really confusing.
M ./compiler/typecheck/TcTyFuns.lhs -14 +9
}}}
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4099#comment:1>
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