GHC crashes with multiple => in instance
GHC will crash (rather than a syntax error) if you write
import Data.Array.Unboxed
newtype Vector r = Vector (UArray Int r)
instance (IArray UArray r) => (Num r) => Num (Vector r) where
(Vector v1) + (Vector v2) = Vector $ listArray (0,0) []
This is unfortunately the smallest program I found that crashes the compiler; removing the definition of (+) yields a syntax error as expected.
Trac metadata
Trac field | Value |
---|---|
Version | 7.6.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
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Blocking | |
CC | |
Operating system | |
Architecture |