This page tests issues of scope with nested functions.

Before parsing f:
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PASS: typeof f should be function and is.
PASS: typeof f.f1 should be undefined and is.

After parsing f, but before calling f:
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PASS: typeof f should be function and is.
PASS: typeof f.f1 should be undefined and is.

In call to f:
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PASS: typeof f should be function and is.
PASS: typeof f1 should be function and is.
PASS: typeof f.f1 should be undefined and is.
PASS: typeof x should be number and is.
PASS: typeof y should be undefined and is.