Add a Monad instance for ((,) w)
Now Monoid is defined in GHC.Base; We can define a reasonable Monad instance for (,) w
, as a writer monad.
Trac metadata
Trac field | Value |
---|---|
Version | 7.8.4 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | libraries/base |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | ekmett, hvr |
Operating system | |
Architecture |