newtype fixpoint sends the compiler into an infinite loop
I was playing around with some edge cases in the type system and hit an infinite loop compiling the following program:
module CompilerBug where
newtype Fix a = Fix (a (Fix a))
data ID a = ID a
newtype I a = I a
testOk :: Fix ID
testOk = undefined
-- this definition causes the compiler to fail to terminate
testInfiniteLoop :: Fix I
testInfiniteLoop = undefined
Trac metadata
Trac field | Value |
---|---|
Version | 6.6.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | Windows |
Architecture | x86 |