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d17284ae29
There were two bugs lurking in mlir.ir.loc_tracebacks():
1) The default None parameter was not handled correctly (passed to a
C++ function that expects ints.
2) The `yield` was incorrectly indented meaning loc_tracebacks()
could not be nested (a "generator didn't yield" exception would be
raised).
Added testing of loc_tracebacks by replacing the custom contextmanager
in the auto_location.py test with the loc_tracebacks() API.
Had to harden the test to line number differences.
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Co-authored-by: James Molloy <jmolloy@google.com>