Missing instance of MonadFix for Q
Q
is capable of being an instance of MonadFix
. The definition of mfix
is the same as fixIO
except that the MVar
handling is wrapped in runIO
.
instance MonadFix Q where
mfix k = do
m <- runIO newEmptyMVar
ans <- runIO (unsafeInterleaveIO (takeMVar m))
result <- k ans
runIO (putMVar m result)
pure result
Trac metadata
Trac field | Value |
---|---|
Version | |
Type | FeatureRequest |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Template Haskell |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |