[syntax-errors] Tuple unpacking in for
statement iterator clause before Python 3.9
#16558
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Summary
This PR reuses a slightly modified version of the
check_tuple_unpacking
method added for detecting unpacking inreturn
andyield
statements to detect the same issue in the iterator clause offor
loops.I ran into the same issue with a bare
for x in *rest: ...
example (invalid even on Python 3.13) and added it as a comment on #16520.I considered just making this an additional
StarTupleKind
variant as well, but this change was in a different version of Python, so I kept it separate.Test Plan
New inline tests.