#3447: Class restrictions on type instances
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Reporter: LysikovVV | Owner:
Type: feature request | Status: new
Priority: normal | Milestone: 6.14.1
Component: Compiler | Version: 6.10.4
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Os: Unknown/Multiple
Architecture: Unknown/Multiple |
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Comment (by simonpj):
The right thing seems to be to make `BoolT (NotT a)` a superclass, thus:
{{{
class BoolT (NotT a) => BoolT a where
type NotT a
}}}
This is legal with `-XFlexibleContexts`. Perhaps you can see if that
serves your purpose?
Simon
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3447#comment:2>
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