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bpo-35975: Support parsing earlier minor versions of Python 3 (GH-12086)
This adds a `feature_version` flag to `ast.parse()` (documented) and `compile()` (hidden) that allow tweaking the parser to support older versions of the grammar. In particular if `feature_version` is 5 or 6, the hacks for the `async` and `await` keyword from PEP 492 are reinstated. (For 7 or higher, these are unconditionally treated as keywords, but they are still special tokens rather than `NAME` tokens that the parser driver recognizes.) https://bugs.python.org/issue35975
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29 changed files with 476 additions and 201 deletions
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@ -330,6 +330,7 @@ PyAST_CompileObject(mod_ty mod, PyObject *filename, PyCompilerFlags *flags,
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goto finally;
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if (!flags) {
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local_flags.cf_flags = 0;
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local_flags.cf_feature_version = PY_MINOR_VERSION;
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flags = &local_flags;
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}
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merged = c.c_future->ff_features | flags->cf_flags;
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