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 = undefinedTrac 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 |
Edited by guest