Random crashes in Windows upon use of (:~) with Event - Githubissues

jodonoghue / wxHaskell

wxWidgets wrapper for Haskell

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Random crashes in Windows upon use of (:~) with Event #20

Open sukhmel opened 10 years ago

sukhmel commented 10 years ago

When (:~) is used with set ... [on command ...], program crashes, and prints Segmentation fault/access violation in generated code message;
Crashes occur frequently, but not always;
In case when tested with only one object, crash never happens immediately after start;
Upon use of (:=), everything works fine;
Sample code is provided.

This issue was fully decribed in HeinrichApfelmus/reactive-banana#62.

when line with (:=), marked with a comment, is used, everything is perfectly fine
when (:~) is used, random crashes occur frequently.


> import Control.Monad (replicateM, mapM_)
> import Graphics.UI.WX

> main = start $ do
>        pad     <- frame [ ]                     
>        buttons <- replicateM 2
>                 $ button pad  []

>        mapM_ (flip set [on command := return ()]) buttons -- OK
>        mapM_ (flip set [on command :~ const (return ())]) buttons

swamp-agr commented 10 years ago

Cannot reproduce bug with this environment:

wxWidgets: 2.9.5
ghc: 7.6.3
MinGW (for wxWidgets build): 5.1.16
MinGW (for wx build) - default for Haskell Platform.
MSYS: 1.0
wx: 0.90.1.1