#9739: GHC 7.8 chokes on recursive classes -------------------------------------+------------------------------------- Reporter: bitonic | Owner: Type: bug | Status: new Priority: normal | Milestone: 7.10.1 Component: Compiler | Version: 7.9 (Type checker) | Keywords: Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: Compile- | Related Tickets: time crash | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by dfeuer): Replying to [comment:4 bitonic]:
Aaaand with only two classes:
{{{#!hs module Foo where
class Class2 a => Class1 a where class3 :: (Class2 a) => b
class (Class1 a) => Class2 a where }}}
The two-class version doesn't loop in 7.9; it just gets an error as it should. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9739#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler