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// Test that dead code warnings are issued for superfluous assignments of
// fields or variables to themselves (issue #75356).
// ignore-test FIXME(81658, 83171)
// check-pass
#![allow(unused_assignments)]
#![warn(dead_code)]
fn main() {
let mut x = 0;
x = x;
//~^ WARNING: useless assignment of variable of type `i32` to itself
x = (x);
//~^ WARNING: useless assignment of variable of type `i32` to itself
x = {x};
// block expressions don't count as self-assignments
struct S<'a> { f: &'a str }
let mut s = S { f: "abc" };
s = s;
//~^ WARNING: useless assignment of variable of type `S` to itself
s.f = s.f;
//~^ WARNING: useless assignment of field of type `&str` to itself
struct N0 { x: Box<i32> }
struct N1 { n: N0 }
struct N2(N1);
struct N3 { n: N2 };
let mut n3 = N3 { n: N2(N1 { n: N0 { x: Box::new(42) } }) };
n3.n.0.n.x = n3.n.0.n.x;
//~^ WARNING: useless assignment of field of type `Box<i32>` to itself
let mut t = (1, ((2, 3, (4, 5)),));
t.1.0.2.1 = t.1.0.2.1;
//~^ WARNING: useless assignment of field of type `i32` to itself
let mut y = 0;
macro_rules! assign_to_y {
($cur:expr) => {{
y = $cur;
}};
}
assign_to_y!(y);
// self-assignments in macro expansions are not reported either
}
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