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  • #5365

Closed
Open
Created Jul 31, 2011 by Edward Kmett@ekmett

Finalizer running prematurely in ghci

I have been building a library for doing hash consing, but it seemed to incorrectly finalize references to live entries in the hash cons table when I use it from ghci.

I've distilled the problem to the following test case.

Prelude System.Mem.Weak GHC.IO> let x = let y = "foo" in (unsafePerformIO $ addFinalizer y (putStrLn "deleted")) `seq` y
Prelude System.Mem.Weak GHC.IO> x
"foo"
deleted
Prelude System.Mem.Weak GHC.IO> x
"foo"
Trac metadata
Trac field Value
Version 7.0.3
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component GHCi
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