#4296: The dreaded SkolemOccurs problem
---------------------------------+------------------------------------------
Reporter: simonpj | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.12.3
Keywords: | Testcase:
indexed-types/should_compile/Simple20
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
---------------------------------+------------------------------------------
The "!SkolemOccurs" problem is a celebrated difficulty with combining (a)
termination and (b) completeness, in this example:
{{{
type instance F [a] = [F a]
f :: (F [a] ~ a) => ...
}}}
Currently we err on the side of completeness, and lose termination.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4296>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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