std::line macro can be wrong in 1.44.1 stable under proc-macros

[elichai]

Hi,
This issue seems to be solved on nightly but I couldn't find an explicit change in that code, so if this issue isn't helpful feel free to close.

I have a proc-macro that generates loggings, and on one occurrence it gets the line number wrong on stable but right on nightly:
The test: https://github.com/elichai/log-derive/blob/2020-test-logger/tests/first.rs#L121
Fails on stable: https://travis-ci.com/github/elichai/log-derive/jobs/357565126#L305
Passes on nightly: https://travis-ci.com/github/elichai/log-derive/jobs/357565129#L314

Using cargo-bisect-rustcI found that the bug was fixed in a9ca1ec (https://pastebin.com/raw/0rwkWwZU) but I don't see anything related there

If this is helpful I can try and create a minimal reproducible code, but because it's fixed in nightly I'm not sure if it's worth the time

[SNCPlay42]

Looks to me like #72306 changed some behavior that affects spans, and fixed this as a result.

The symptoms look sufficiently different from the issues #72306 intentionally fixed that a regression test for this specifically might be worthwhile.

@rustbot modify labels: E-needs-mcve E-needs-test