rust/tests/ui/mem_discriminant.rs

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// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
#![deny(clippy::mem_discriminant_non_enum)]
use std::mem;
enum Foo {
One(usize),
Two(u8),
}
struct A(Foo);
fn main() {
// bad
mem::discriminant(&"hello");
mem::discriminant(&&Some(2));
mem::discriminant(&&None::<u8>);
mem::discriminant(&&Foo::One(5));
mem::discriminant(&&Foo::Two(5));
mem::discriminant(&A(Foo::One(0)));
let ro = &Some(3);
let rro = &ro;
mem::discriminant(&ro);
mem::discriminant(rro);
mem::discriminant(&rro);
macro_rules! mem_discriminant_but_in_a_macro {
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($param:expr) => {
mem::discriminant($param)
};
}
mem_discriminant_but_in_a_macro!(&rro);
let rrrrro = &&&rro;
mem::discriminant(&rrrrro);
mem::discriminant(*rrrrro);
// ok
mem::discriminant(&Some(2));
mem::discriminant(&None::<u8>);
mem::discriminant(&Foo::One(5));
mem::discriminant(&Foo::Two(5));
mem::discriminant(ro);
mem::discriminant(*rro);
mem::discriminant(****rrrrro);
}