Data.Vector.foldl' hangs GHC indefinitely with -O2
Running 'ghc -O2 -fforce-recomp -c Bug.hs' on the following
module Bug where
import qualified Data.Vector as V
data Tree = Empty | Node !(V.Vector Tree)
f :: k -> Tree -> Tree
f k' (Node ch) = head $ V.foldl' (\u t' -> case t' of Empty -> u; _ -> t' : u) [] ch
will hang forever (or at least >5m). Builds fine with -O1 / V.foldl.
Trac metadata
Trac field | Value |
---|---|
Version | 7.6.3 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | high |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |