Unlifted newtypes via GADTSyntax
GHC disallows to define a newtype of an unlifted type (newtype A = A Int#). However, this restriction is not enforced when the newtype is defined using GADT syntax:
newtype A where
A :: Int# -> AFor example, I can derive Show for A and on my machine main = print (A 0#) segfaults.
Tested on GHC 8.0.1 and master.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 8.0.1 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler (Type checker) |
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