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Issue #19655: Replace the ASDL parser carried with CPython
The new parser does not rely on Spark (which is now removed from our repo), uses modern 3.x idioms and is significantly smaller and simpler. It generates exactly the same AST files (.h and .c), so in practice no builds should be affected.
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‎Misc/NEWS‎

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@@ -57,6 +57,11 @@ Core and Builtins
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- Issue #19995: %c, %o, %x, and %X now raise TypeError on non-integer input.
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- Issue #19655: The ASDL parser - used by the build process to generate code for
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managing the Python AST in C - was rewritten. The new parser is self contained
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and does not require to carry long the spark.py parser-generator library;
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spark.py was removed from the source base.
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- Issue #12546: Allow \x00 to be used as a fill character when using str, int,
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float, and complex __format__ methods.
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