-fwarn-unused-do-bind with type families
When using acid-state, I get warnings for "unused do binds" from functions that return () but whose type involve asssociated types:
update :: UpdateEvent event => AcidState (EventState event) -> event -> IO (EventResult event)Shouldn't GHC be able to deduce when EventResult resolves to unit?
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.4.1 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |