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Auto merge of #4107 - taiki-e:useless_attribute, r=flip1995

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useless_attribute: Add unreachable_pub to whitelists

Fixes #4106

changelog: `useless_attribute`: whitelist `unreachable_pub` on `use` items
This commit is contained in:
bors 2019-05-19 10:37:09 +00:00
commit 0417a0ac4d
3 changed files with 20 additions and 6 deletions
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9
clippy_lints/src/attrs.rs
View file

@ -49,9 +49,9 @@ declare_clippy_lint! {
/// **What it does:** Checks for `extern crate` and `use` items annotated with
/// lint attributes.
///
/// This lint whitelists `#[allow(unused_imports)]` and `#[allow(deprecated)]` on
/// `use` items and `#[allow(unused_imports)]` on `extern crate` items with a
/// `#[macro_use]` attribute.
/// This lint whitelists `#[allow(unused_imports)]`, `#[allow(deprecated)]` and
/// `#[allow(unreachable_pub)]` on `use` items and `#[allow(unused_imports)]` on
/// `extern crate` items with a `#[macro_use]` attribute.
///
/// **Why is this bad?** Lint attributes have no effect on crate imports. Most
/// likely a `!` was forgotten.
@ -239,13 +239,14 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Attributes {
if let Some(ident) = attr.ident() {
match &*ident.as_str() {
"allow" | "warn" | "deny" | "forbid" => {
// whitelist `unused_imports` and `deprecated` for `use` items
// whitelist `unused_imports`, `deprecated` and `unreachable_pub` for `use` items
// and `unused_imports` for `extern crate` items with `macro_use`
for lint in lint_list {
match item.node {
ItemKind::Use(..) => {
if is_word(lint, sym!(unused_imports))
|| is_word(lint, sym!(deprecated))
|| is_word(lint, sym!(unreachable_pub))
{
return;
}

13
tests/ui/useless_attribute.rs
View file

@ -1,6 +1,7 @@
// aux-build:proc_macro_derive.rs
#![warn(clippy::useless_attribute)]
#![warn(unreachable_pub)]
#[allow(dead_code)]
#[cfg_attr(feature = "cargo-clippy", allow(dead_code))]
@ -32,4 +33,16 @@ pub use foo::Bar;
#[derive(DeriveSomething)]
struct Baz;
// don't lint on unreachable_pub for `use` items
mod a {
mod b {
#[allow(dead_code)]
#[allow(unreachable_pub)]
pub struct C {}
}
#[allow(unreachable_pub)]
pub use self::b::C;
}
fn main() {}

4
tests/ui/useless_attribute.stderr
View file

@ -1,5 +1,5 @@
error: useless lint attribute
--> $DIR/useless_attribute.rs:5:1
--> $DIR/useless_attribute.rs:6:1
|
LL | #[allow(dead_code)]
| ^^^^^^^^^^^^^^^^^^^ help: if you just forgot a `!`, use: `#![allow(dead_code)]`
@ -7,7 +7,7 @@ LL | #[allow(dead_code)]
= note: `-D clippy::useless-attribute` implied by `-D warnings`
error: useless lint attribute
--> $DIR/useless_attribute.rs:6:1
--> $DIR/useless_attribute.rs:7:1
|
LL | #[cfg_attr(feature = "cargo-clippy", allow(dead_code))]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: if you just forgot a `!`, use: `#![cfg_attr(feature = "cargo-clippy", allow(dead_code)`