[issue11105] Compiling evil ast crashes interpreter

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

Alex: If the node attributes were not mutable, it would be extremely awkward, not to say inefficient, to mutate an already existing AST as returned by ast.parse().

The AST objects in the _ast module aren't what Python works with internally, anyway. When calling ast.parse(), the AST is converted to Python objects (these are defined in Python-ast.c), and compile()ing such an object converts them back to the internal tree representation.  This conversion is where recursions would need to be handled.

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nosy: +georg.brandl

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