rust/tests/compile-fail/mut_reference.rs

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#![feature(plugin)]
#![plugin(clippy)]
fn takes_an_immutable_reference(a: &i32) {
}
fn takes_a_mutable_reference(a: &mut i32) {
}
struct MyStruct;
impl MyStruct {
fn takes_an_immutable_reference(&self, a: &i32) {
}
fn takes_a_mutable_reference(&self, a: &mut i32) {
}
}
#[deny(unnecessary_mut_passed)]
fn main() {
// Functions
takes_an_immutable_reference(&mut 42); //~ERROR The function/method "takes_an_immutable_reference" doesn't need a mutable reference
// Methods
let my_struct = MyStruct;
my_struct.takes_an_immutable_reference(&mut 42); //~ERROR The function/method "takes_an_immutable_reference" doesn't need a mutable reference
// No error
// Functions
takes_an_immutable_reference(&42);
takes_a_mutable_reference(&mut 42);
let mut a = &mut 42;
takes_an_immutable_reference(a);
// Methods
my_struct.takes_an_immutable_reference(&42);
my_struct.takes_a_mutable_reference(&mut 42);
my_struct.takes_an_immutable_reference(a);
}