[GHC] #8264: Canonical way to prevent manual instances
GHC
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Wed Sep 11 16:11:12 CEST 2013
#8264: Canonical way to prevent manual instances
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Reporter: nomeata | Owner:
Type: task | Status: new
Priority: normal | Milestone:
Component: Compiler (Type checker) | Version: 7.6.3
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
Type of failure: None/Unknown | Unknown/Multiple
Test Case: | Difficulty: Unknown
Blocking: | Blocked By:
| Related Tickets:
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Comment (by monoidal):
I don't know internals, but this mechanism might also work for `(~)` and
`(<=)` constraints (type-level naturals inequality). Currently they give
"Malformed instance" error.
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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8264#comment:2>
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