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rust-clippy/tests/ui/mut_reference.rs

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#![allow(unused_variables)]
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fn takes_an_immutable_reference(a: &i32) {}
fn takes_a_mutable_reference(a: &mut i32) {}
struct MyStruct;
impl MyStruct {
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fn takes_an_immutable_reference(&self, a: &i32) {}
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fn takes_a_mutable_reference(&self, a: &mut i32) {}
}
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#[warn(clippy::unnecessary_mut_passed)]
fn main() {
// Functions
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takes_an_immutable_reference(&mut 42);
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let as_ptr: fn(&i32) = takes_an_immutable_reference;
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as_ptr(&mut 42);
// Methods
let my_struct = MyStruct;
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my_struct.takes_an_immutable_reference(&mut 42);
// No error
// Functions
takes_an_immutable_reference(&42);
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let as_ptr: fn(&i32) = takes_an_immutable_reference;
as_ptr(&42);
takes_a_mutable_reference(&mut 42);
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let as_ptr: fn(&mut i32) = takes_a_mutable_reference;
as_ptr(&mut 42);
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let 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);
}