doctests don't print warnings by default

[Susurrus]

Running cargo test runs doctests by default, and shows warnings for regular code, but not for the doctests themselves. This can be enabled by running cargo test -- --nocapture. I'd like to have warnings also show in our CI tests, even for doctests, but setting -- --nocapture shows all the output which we don't want (and can't control, because they come from the underlying libraries complaining about our tests that are supposed to fail).

I'd think having warnings on for doctests by default would be good, but that wouldn't be backwards compatible. Maybe a --doctest-warnings option could be added in lieu of that?

[alexcrichton]

I believe this is a bug for rustdoc, not cargo?

[alexcrichton]

er didn't mean to close yet

[Susurrus]

Sure, is rustdoc an external crate? I didn't see it under rust-lang so I figured it was part of cargo. Where should I file tickets for this? Also, should this ticket stay open if the default behavior of rustdoc might change?

[alexcrichton]

Oh it's just a portion of the rust-lang/rust repository

[Susurrus]

Should I file this issue with rust or rfcs then?

[alexcrichton]

Oh just in rust-lang/rust is fine, likely no need for an rfc

[Susurrus]

Closing in lieu of rust-lang/rust#41574