rust/tests/ui/shadow.rs

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#![feature(plugin)]
#![plugin(clippy)]
#![deny(clippy, clippy_pedantic)]
#![allow(unused_parens, unused_variables, missing_docs_in_private_items)]
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fn id<T>(x: T) -> T { x }
fn first(x: (isize, isize)) -> isize { x.0 }
fn main() {
let mut x = 1;
let x = &mut x; //~ERROR `x` is shadowed by itself in `&mut x`
let x = { x }; //~ERROR `x` is shadowed by itself in `{ x }`
let x = (&*x); //~ERROR `x` is shadowed by itself in `(&*x)`
let x = { *x + 1 }; //~ERROR `x` is shadowed by `{ *x + 1 }` which reuses
let x = id(x); //~ERROR `x` is shadowed by `id(x)` which reuses
let x = (1, x); //~ERROR `x` is shadowed by `(1, x)` which reuses
let x = first(x); //~ERROR `x` is shadowed by `first(x)` which reuses
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let y = 1;
let x = y; //~ERROR `x` is shadowed by `y`
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let x; //~ERROR `x` shadows a previous declaration
x = 42;
let o = Some(1_u8);
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if let Some(p) = o { assert_eq!(1, p); }
match o {
Some(p) => p, // no error, because the p above is in its own scope
None => 0,
};
match (x, o) {
(1, Some(a)) | (a, Some(1)) => (), // no error though `a` appears twice
_ => (),
}
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}