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bpo-32436: Implement PEP 567#5027

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1st1 merged 24 commits intopython:masterpython/cpython:masterfrom 1st1:pep5671st1/cpython:pep567Copy head branch name to clipboardJan 23, 2018

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Commits on Jan 22, 2018

• bpo-32436: Implement PEP 567

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• Add Token.MISSING, token.old_val; token.var

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• Make PyContextVar_Get return a new ref

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• Explain HAMT

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• Mention how to debug HAMT

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• Address review feedback

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• ThreadState now refs to a Context object (fixes Context.run/__getitem__)

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• Document hamt_t enum types

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• Add a test

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• Add Context.copy() method

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• Harden PyContext_Exit to check that the current context matches

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• Simplify context_new() logic

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• Token.reset() checks the context too now

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• Token.old_val -> Token.old_value

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• Test that subclassing is prohibited

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• Make ContextVar.reset raise an error for already used tokens

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• Drop unused file

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• Reword a comment

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• Address Inada-sun comments

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• Cache empty HAMT node

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• Don't GC-track ContextVars if name/default are not tracked

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• Handle an error if rehashing fails

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• PyContext_CopyCurrent() & PyContext_Copy() (sync with the PEP)

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• Fix asynciomodule.c to use new PyContext_CopyCurrent

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