Bad error message when `!` is used without BangPatterns extension
For
f :: a -> a
f !x = x
ghc-HEAD gives
P.hs:22:1: error:
The type signature for ‘f’ lacks an accompanying binding
|
22 | f :: a -> a
| ^
Here ghc should suggest BangPatterns
extension.
Trac metadata
Trac field | Value |
---|---|
Version | 8.5 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |