Fix unlikely but possible race in `WeakValueDictionary` It may happen that value in `valueArray` could have been already collected by the GC but #clearDeadSlots have not yet been called. When this happened, `#at:ifAbsentPut:` returned tombstone rather than updating the dictionary with value from block. This commit fixes this by checking whether `valueArray` contain the tombstone and if so, clearing up the dead slots and restarting the operation. HTH.

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@REM -------

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@REM make using Borland bcc32

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@REM type bmake, and wait...

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@REM do not edit - automatically generated from ProjectDefinition

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@REM -------

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@SET DEFINES=

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@REM Kludge got Mercurial, cannot be implemented in Borland make

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@FOR /F "tokens=*" %%i in ('hg root') do SET HGROOT=%%i

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@IF "%HGROOT%" NEQ "" SET DEFINES=%DEFINES% "-DHGROOT=%HGROOT%"

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make.exe -N -f bc.mak  %DEFINES% %*

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