GHC shouldn't expand constraint synonyms
{-# LANGUAGE ConstraintKinds #-}
type ShowX = Show
showX :: ShowX a => a -> String
showX = show
If I now ask for the type of showX, I get:
*Main> :t showX
showX :: Show a => a -> String
Trac metadata
Trac field | Value |
---|---|
Version | 7.8.2 |
Type | FeatureRequest |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |