[issue26145] PEP 511: Add sys.set_code_transformers()

[STINNER Victor]

STINNER Victor added the comment:

> Note: ast.PyCF_TRANSFORMED_AST is not implemented yet.

Additionnal pycf_transformed_ast.patch implements it. The patch should be applied on top of transformers-4.patch.

Note: PyCF_TRANSFORMED_AST has the same value (0x1000) than the old constant CO_GENERATOR_ALLOWED. This constant was removed in Python 2.5.0 by the changeset 6b42920accc9 in 2006. Is it an issue?

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Added file: http://bugs.python.org/file41700/pycf_transformed_ast.patch

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