Proposal: Make Q an instance of Applicative
The Q
type:
newtype Q a = Q { unQ :: forall m. Quasi m => m a}
currently has an instance for Monad
and Functor
. I always find it surprising when a monad doesn't have an Applicative
instance. So I would like to propose adding an instance for Applicative
as well.
I also propose to make Applicative
a superclass of the Quasi
class:
class (Monad m, Applicative m, Functor m) => Quasi m where ...
During the discussion on the libraries list Michael Snoyman, Wren ng Thornton and Edward Kmett replied positively. There were no objections.
Trac metadata
Trac field | Value |
---|---|
Version | 7.0.3 |
Type | FeatureRequest |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Template Haskell |
Test case | |
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