GADTs in Haskell98 style
it would be nice if it is possible to write GADTs in Haskell98 style, like this:
data Expr a = I Int :: Expr Int
| B Bool :: Expr Bool
| Add (Expr Int) (Expr Int) :: Expr Int
| Mul (Expr Int) (Expr Int) :: Expr Int
| Eq (Expr Int) (Expr Int) :: Expr Bool
| Magic (Expr a) (Expr a)
Trac metadata
Trac field | Value |
---|---|
Version | 7.6.3 |
Type | FeatureRequest |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler (Type checker) |
Test case | |
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