Here are all the Failing tests in Pharo4, with a link to the issue tracker.
We should try to get it green, not much left to do:
Related to NativeBoost:
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ReleaseTest>>#testMethodsWithUnboundGlobals
AJx64AssemblerTests>>#testStringOps64Mnemonics
Related to GT:
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ReleaseTest>>#testUndeclared
ClassTest>>#testClassRespectsPolymorphismWithTrait
ReleaseTest
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ObsoleteTest>>#testFixObsoleteSharedPools