Deriving regression
First reported here: http://www.haskell.org/pipermail/cvs-ghc/2010-September/056008.html
This module:
module Foo where
data Ord a => Heap a b = Empty | Node a b [Heap a b]
deriving Eq
is rejected by HEAD:
$ hd -c h.hs
h.hs:1:1:
No instance for (Ord a)
arising from a use of `Node'
In the pattern: Node _ _ _
In an equation for `$con2tag_Heap': $con2tag_Heap (Node _ _ _) = 1#
Trac metadata
Trac field | Value |
---|---|
Version | 6.13 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | highest |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |