Bugs item #753777, was opened at 2003-06-13 07:16
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Category: Compiler (Type checker)
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Simon Peyton Jones (simonpj)
Assigned to: Nobody/Anonymous (nobody)
Summary: Unboxed tuples as values
Initial Comment:
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.
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