Add Applicative and Monoid instances for STM
instance Applicative STM where { pure = return; (<*>) = ap }
instance Monoid (STM a) where { mempty = retry; mappend = orElse }
I don't know where these instances would go. Nor whether this is a libraries or GHC proposal.
Trac metadata
Trac field | Value |
---|---|
Version | 6.8.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | libraries/base |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | conal@conal.net |
Operating system | Unknown |
Architecture | Unknown |