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 Eqis 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 |