rust/compiler/rustc_lint
bors eb4860c7e1 Auto merge of #78864 - Mark-Simulacrum:warn-on-forbids, r=pnkfelix
Use true previous lint level when detecting overriden forbids

Previously, cap-lints was ignored when checking the previous forbid level, which
meant that it was a hard error to do so. This is different from the normal
behavior of lints, which are silenced by cap-lints; if the forbid would not take
effect regardless, there is not much point in complaining about the fact that we
are reducing its level.

It might be considered a bug that even `--cap-lints deny` would suffice to
silence the error on overriding forbid, depending on if one cares about failing
the build or precisely forbid being set. But setting cap-lints to deny is quite
odd and not really done in practice, so we don't try to handle it specially.

This also unifies the code paths for nested and same-level scopes. However, the
special case for CLI lint flags is left in place (introduced by #70918) to fix
the regression noted in #70819. That means that CLI flags do not lint on forbid
being overridden by a non-forbid level. It is unclear whether this is a bug or a
desirable feature, but it is certainly inconsistent. CLI flags are a
sufficiently different "type" of place though that this is deemed out of scope
for this commit.

r? `@pnkfelix` perhaps?

cc #77713 -- not marking as "Fixes" because of the lack of proper unused attribute handling in this PR
2020-12-02 02:07:45 +00:00
..
src Auto merge of #78864 - Mark-Simulacrum:warn-on-forbids, r=pnkfelix 2020-12-02 02:07:45 +00:00
Cargo.toml Parse the format string for the panic_fmt lint for better warnings. 2020-10-20 22:25:42 +02:00