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Node.warn asserted that get_fslocation_from_item returned a non-None lineno, but non-Python items that do not override reportinfo() report None, so calling node.warn() raised AssertionError. Fall back to lineno 0 (consistent with the -1 sentinel used by get_fslocation_from_item) so the warning is emitted normally.
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Disclosure note: this PR was diagnosed and implemented with the help of an AI coding agent; I verified the diagnosis, ran the regression test red-then-green locally (test_nodes.py 16 passed, related suites 183 passed), and applied the repo's ruff lint/format checks myself. Apologies for not stating this in the original description - #15359's closure made the expectation explicit, and I've adopted it. The fix itself stands as reviewed: |
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Node.warn()crashes withAssertionErrorwhen called on a non-Python item that does not overridereportinfo().The default
reportinfo()returns(self.path, None, ""), soget_fslocation_from_item()yieldslineno=None.Node.warn()then hitsassert lineno is not Noneand raises, preventing the warning from being emitted at all.This affects custom/non-Python test items (documented in Non-Python tests) that call
self.warn()duringruntest()or collection.The fix removes the assertion and falls back to
lineno=0whenlineno is None, consistent with the existing-1sentinel used byget_fslocation_from_item()(which becomes0after the+1adjustment). This matches the approach already accepted in #14855 for a similarNonelineno issue inreports.py.A regression test adds a custom
.customitem with defaultreportinfo()that callsself.warn()inruntest(), verifying the warning is emitted normally instead of crashing.