Unboxed tuples as values
Consider
type T a = Int -> (# Int, Int #)
f :: T a -> T a
f t = \x -> case t x of r -> r
gives the following error message:
ghc-5.04.1: panic! (the `impossible' happened, GHC
version 5.04.1):
codeGen/CgRetConv.lhs:83: Non-exhaustive
patterns in function
dataReturnConvPrim
Trouble is that 'r' is bound to an unboxed tuple. This
should fail, but in 5.04.1 it crashes the compiler. In 6.0
it's worse: the code will core dump because it enters R1.
But it should be rejected in the type checker.
Trac metadata
Trac field | Value |
---|---|
Version | None |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | ResolvedFixed |
Component | Compiler (Type checker) |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |