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 |
| Test case | |
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| Blocking | |
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