rust/tests/ui/suspicious_arithmetic_impl.rs

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#![warn(suspicious_arithmetic_impl)]
use std::ops::{Add, AddAssign, Mul, Sub, Div};
#[derive(Copy, Clone)]
struct Foo(u32);
impl Add for Foo {
type Output = Foo;
fn add(self, other: Self) -> Self {
Foo(self.0 - other.0)
}
}
impl AddAssign for Foo {
fn add_assign(&mut self, other: Foo) {
*self = *self - other;
}
}
impl Mul for Foo {
type Output = Foo;
fn mul(self, other: Foo) -> Foo {
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Foo(self.0 * other.0 % 42) // OK: BinOpKind::Rem part of BiExpr as parent node
}
}
impl Sub for Foo {
type Output = Foo;
fn sub(self, other: Self) -> Self {
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Foo(self.0 * other.0 - 42) // OK: BinOpKind::Mul part of BiExpr as child node
}
}
impl Div for Foo {
type Output = Foo;
fn div(self, other: Self) -> Self {
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Foo(do_nothing(self.0 + other.0) / 42) // OK: BinOpKind::Add part of BiExpr as child node
}
}
struct Bar(i32);
impl Add for Bar {
type Output = Bar;
fn add(self, other: Self) -> Self {
Bar(self.0 & !other.0) // OK: UnNot part of BiExpr as child node
}
}
impl Sub for Bar {
type Output = Bar;
fn sub(self, other: Self) -> Self {
if self.0 <= other.0 {
Bar(-(self.0 & other.0)) // OK: UnNeg part of BiExpr as parent node
} else {
Bar(0)
}
}
}
fn main() {}
fn do_nothing(x: u32) -> u32 {
x
}