`#[no_coverage]` is working but `#[cfg_attr(tarpaulin, no_coverage)]` not

[ventaquil]

Describe the bug

I am conditionally add no_coverage attribute only if --cfg tarpaulin is set.

#[cfg_attr(tarpaulin, no_coverage)]
mod info;

It's not working but putting just #[no_coverage] works as expected.

To Reproduce

1. Create function and add attribute #[cfg_attr(tarpaulin, no_coverage)].
2. Run cargo tarpaulin.
3. Check report - function is included in coverage lines.
4. Change attribute into #[no_coverage].
5. Run cargo tarpaulin.
6. Check report - function is ignored as expected.

Expected behavior

Item should be ignored from coverage.

Live example

Check my ferric-bytes/chksum-build repo - specially code below.

https://github.com/ferric-bytes/chksum-build/blob/299e286ddfea98edc0687d63c8959ce7e3ebd264/src/lib.rs#L178-L179

Possible fix

As far as I understand some extra checks should be added to this function.

https://github.com/xd009642/tarpaulin/blob/343e912bf33a3872ff9f49d48686831d7ca701da/src/source_analysis/attributes.rs#L35-L73

[xd009642]

I've just opened a PR which should fix this, if it does I'll likely do a new release once it's merged in :tada: