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|
//@aux-build:proc_macro_derive.rs
#![warn(clippy::shadow_same, clippy::shadow_reuse, clippy::shadow_unrelated)]
#![allow(
clippy::let_unit_value,
clippy::needless_if,
clippy::redundant_guards,
clippy::redundant_locals
)]
extern crate proc_macro_derive;
#[derive(proc_macro_derive::ShadowDerive)]
pub struct Nothing;
macro_rules! reuse {
($v:ident) => {
let $v = $v + 1;
};
}
fn shadow_same() {
let x = 1;
let x = x;
//~^ shadow_same
let mut x = &x;
//~^ shadow_same
let x = &mut x;
//~^ shadow_same
let x = *x;
//~^ shadow_same
}
fn shadow_reuse() -> Option<()> {
let x = ([[0]], ());
let x = x.0;
//~^ shadow_reuse
let x = x[0];
//~^ shadow_reuse
let [x] = x;
//~^ shadow_reuse
let x = Some(x);
//~^ shadow_reuse
let x = foo(x);
//~^ shadow_reuse
let x = || x;
//~^ shadow_reuse
let x = Some(1).map(|_| x)?;
//~^ shadow_reuse
let y = 1;
let y = match y {
//~^ shadow_reuse
1 => 2,
_ => 3,
};
None
}
fn shadow_reuse_macro() {
let x = 1;
// this should not warn
reuse!(x);
}
fn shadow_unrelated() {
let x = 1;
let x = 2;
//~^ shadow_unrelated
}
fn syntax() {
fn f(x: u32) {
let x = 1;
//~^ shadow_unrelated
}
let x = 1;
match Some(1) {
Some(1) => {},
Some(x) => {
//~^ shadow_unrelated
let x = 1;
//~^ shadow_unrelated
},
_ => {},
}
if let Some(x) = Some(1) {}
//~^ shadow_unrelated
while let Some(x) = Some(1) {}
//~^ shadow_unrelated
let _ = |[x]: [u32; 1]| {
//~^ shadow_unrelated
let x = 1;
//~^ shadow_unrelated
};
let y = Some(1);
if let Some(y) = y {}
//~^ shadow_reuse
}
fn negative() {
match Some(1) {
Some(x) if x == 1 => {},
Some(x) => {},
None => {},
}
match [None, Some(1)] {
[Some(x), None] | [None, Some(x)] => {},
_ => {},
}
if let Some(x) = Some(1) {
let y = 1;
} else {
let x = 1;
let y = 1;
}
let x = 1;
#[allow(clippy::shadow_unrelated)]
let x = 1;
}
fn foo<T>(_: T) {}
fn question_mark() -> Option<()> {
let val = 1;
// `?` expands with a `val` binding
None?;
None
}
pub async fn foo1(_a: i32) {}
pub async fn foo2(_a: i32, _b: i64) {
let _b = _a;
//~^ shadow_unrelated
}
fn ice_8748() {
let _ = [0; {
let x = 1;
if let Some(x) = Some(1) { x } else { 1 }
//~^ shadow_unrelated
}];
}
// https://github.com/rust-lang/rust-clippy/issues/10780
fn shadow_closure() {
// These are not shadow_unrelated; but they are correctly shadow_reuse
let x = Some(1);
#[allow(clippy::shadow_reuse)]
let y = x.map(|x| x + 1);
let z = x.map(|x| x + 1);
//~^ shadow_reuse
let a: Vec<Option<u8>> = [100u8, 120, 140]
.iter()
.map(|i| i.checked_mul(2))
.map(|i| i.map(|i| i - 10))
//~^ shadow_reuse
.collect();
}
struct Issue13795 {
value: i32,
}
fn issue13795(value: Issue13795) {
let Issue13795 { value, .. } = value;
//~^ shadow_same
}
fn issue14377() {
let a;
let b;
(a, b) = (0, 1);
struct S {
c: i32,
d: i32,
}
let c;
let d;
S { c, d } = S { c: 1, d: 2 };
}
fn main() {}
|
