[issue30637] Syntax error reported on compile(...), but not on compile(..., ast.PyCF_ONLY_AST)

[Michał Radwański]

Michał Radwański added the comment:

Docs mention:


ast.parse(source, filename='<unknown>', mode='exec')
    Parse the source into an AST node. Equivalent to compile(source, filename, mode, ast.PyCF_ONLY_AST).

If you just parse code into AST, you first check whether it is possible to turn such source into a Python syntax tree. In that case, it obviously is, as you may imagine a function, that returns nothing:

def func():
    return

If however you try to make executable code of the source, it is checked whether the constructs make sense in provided context. And, as you may imagine, top-level code with return statement is not valid, hence the error.

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nosy: +enedil

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<http://bugs.python.org/issue30637>
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