Ticket #124 (closed bug: Fixed)
GHCi segfaults on expression evaluation
|Reported by:||carlossch||Owned by:||simonpj|
|Type of failure:||Difficulty:|
|Test Case:||Blocked By:|
Hello. I think I've come across a GHCi bug. Using the following module, GHCi version 5.04.2 segfaults, apparently trying to compute a type using functional dependencies. The segfault happens when I try to calculate (v1 .> v2). I tried the code on Hugs, and it answers Main> v1 .> v2 V  :: PSOp (Pop a Id) as expected. I think the problem is occuring in the line > instance Reverse a b c => CheckPS Id a b c because if I remove the line > instance Reverse a (Pop t b) c => Reverse (Pop t a) b c instead of segfaulting, GHCi rightfully complains: <interactive>:1: No instance for (Reverse (Pop a Id) Id c) arising from use of `.>' at <interactive>:1 In the definition of `it': v1 .> v2 GHC compiles the program just fine and runs it without any issues. I installed GHC 5.04.2 using the RedHat 8.0 RPM's. If there's any important information you may need from me, please, contact me through my email (firstname.lastname@example.org), I'd be glad to be of help. Carlos
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