Use GeneralizedNewtypeDeriving to automatically create associated type families
Here's a simple example:
class C a where
type T a
instance C Int where
type T Int = Bool
newtype NT = NT Int
deriving CTrac metadata
| Trac field | Value |
|---|---|
| Version | 7.6.3 |
| Type | FeatureRequest |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information