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Create typesafe method of obtaining dictionary types from class definitions, and constraint objects from dictionary types
Say I have a class like the following:
class IntLike a where
fromInt :: Int -> a
toInt :: a -> IntThere should be a typesafe, principled way to get the dictionary type created from buildClass in compiler/iface/BuildTyCl.lhs like such (in this hypothetical, using a type family:
plusN :: (IntLike a) => Int -> Dictionary (IntLike a)It would be nice if the type family was injective, if it was implemented in such a way.
Trac metadata
| Trac field | Value |
|---|---|
| Version | |
| Type | FeatureRequest |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
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| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |