rust/tests/ui/overloaded/overloaded-index-in-field.rs
2024-02-16 20:02:50 +00:00

47 lines
828 B
Rust

//@ run-pass
// Test using overloaded indexing when the "map" is stored in a
// field. This caused problems at some point.
use std::ops::Index;
struct Foo {
x: isize,
y: isize,
}
struct Bar {
foo: Foo
}
impl Index<isize> for Foo {
type Output = isize;
fn index(&self, z: isize) -> &isize {
if z == 0 {
&self.x
} else {
&self.y
}
}
}
trait Int {
fn get(self) -> isize;
fn get_from_ref(&self) -> isize; //~ WARN methods `get_from_ref` and `inc` are never used
fn inc(&mut self);
}
impl Int for isize {
fn get(self) -> isize { self }
fn get_from_ref(&self) -> isize { *self }
fn inc(&mut self) { *self += 1; }
}
fn main() {
let f = Bar { foo: Foo {
x: 1,
y: 2,
} };
assert_eq!(f.foo[1].get(), 2);
}