#8137: Permited mega-polymorphic type ------------------------------------------------+-------------------------- 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: ------------------------------------------------+-------------------------- 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. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8137#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler