58e70e7b14
For a given file
```rust
use std::*;
use std::{};
```
output the following warnings
```
warning: unused import: `use std::{};`, #[warn(unused_imports)] on by default
--> file.rs:2:1
|
2 | use std::{};
| ^^^^^^^^^^^^
warning: unused import: `std::*;`, #[warn(unused_imports)] on by default
--> file.rs:1:5
|
1 | use std::*;
| ^^^^^^^
```
100 lines
2.5 KiB
Rust
100 lines
2.5 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![deny(unused_imports)]
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#![allow(dead_code)]
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use bar::c::cc as cal;
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use std::mem::*; // shouldn't get errors for not using
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// everything imported
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use std::fmt::{};
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//~^ ERROR unused import: `use std::fmt::{};`
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// Should get errors for both 'Some' and 'None'
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use std::option::Option::{Some, None};
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//~^ ERROR unused imports: `None`, `Some`
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//~| ERROR unused imports: `None`, `Some`
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use test::A; //~ ERROR unused import: `test::A`
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// Be sure that if we just bring some methods into scope that they're also
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// counted as being used.
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use test::B;
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// But only when actually used: do not get confused by the method with the same name.
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use test::B2; //~ ERROR unused import: `test::B2`
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// Make sure this import is warned about when at least one of its imported names
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// is unused
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use test2::{foo, bar}; //~ ERROR unused import: `bar`
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mod test2 {
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pub fn foo() {}
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pub fn bar() {}
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}
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mod test {
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pub trait A { fn a(&self) {} }
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pub trait B { fn b(&self) {} }
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pub trait B2 { fn b(&self) {} }
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pub struct C;
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impl A for C {}
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impl B for C {}
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}
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mod foo {
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pub struct Point{pub x: isize, pub y: isize}
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pub struct Square{pub p: Point, pub h: usize, pub w: usize}
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}
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mod bar {
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// Don't ignore on 'pub use' because we're not sure if it's used or not
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pub use std::cmp::PartialEq;
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pub struct Square;
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pub mod c {
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use foo::Point;
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use foo::Square; //~ ERROR unused import: `foo::Square`
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pub fn cc(_p: Point) -> super::Square {
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fn f() -> super::Square {
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super::Square
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}
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f()
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}
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}
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#[allow(unused_imports)]
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mod foo {
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use std::cmp::PartialEq;
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}
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}
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fn g() {
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use self::g; //~ ERROR unused import: `self::g`
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fn f() {
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self::g();
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}
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}
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// c.f. issue #35135
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#[allow(unused_variables)]
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fn h() {
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use test2::foo; //~ ERROR unused import: `test2::foo`
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let foo = 0;
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}
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fn main() {
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cal(foo::Point{x:3, y:9});
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let mut a = 3;
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let mut b = 4;
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swap(&mut a, &mut b);
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test::C.b();
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let _a = foo();
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}
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