#8137: Permited mega-polymorphic type
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Reporter: wvv | Owner:
Type: bug | Status: closed
Priority: normal | Milestone:
Component: Compiler (Type checker) | Version: 7.6.3
Resolution: invalid | Keywords:
Operating System: Unknown/Multiple | Architecture:
Type of failure: GHC accepts invalid program | Unknown/Multiple
Test Case: | Difficulty:
Blocking: | Unknown
| Blocked By:
| Related Tickets:
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Comment (by goldfire):
In the scenario in your comment above, the type `t1` must be a sub-part of
the type `t1`, which is only possible with infinite types. In the original
case in the bug report, we get the equation `t = t`, where `t` is the type
of `u`, which is satisfiable for any type.
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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8137#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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