Untyped functions content show up in mypy output #11155

Bug Report

For default configuration, violations can be reported in untyped (shouldn't be checked) functions.

To Reproduce

def f():
    return UNDEFINED


def g():
    return lambda x: UNDEFINED in x

https://mypy-play.net/?mypy=latest&python=3.10&gist=c49b86bc9067f234a038a71598d2b3b7

Expected Behavior

Both f() and g() are untyped - violations shouldn't be reported in any of those.

Actual Behavior

main.py:6: error: Name "UNDEFINED" is not defined

Your Environment

mypy-play, as linked above.