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59 lines
1.3 KiB
Rust
59 lines
1.3 KiB
Rust
// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(tool_lints)]
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#![allow(unused, clippy::trivially_copy_pass_by_ref)]
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#![warn(clippy::mut_from_ref)]
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struct Foo;
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impl Foo {
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fn this_wont_hurt_a_bit(&self) -> &mut Foo {
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unimplemented!()
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}
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}
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trait Ouch {
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fn ouch(x: &Foo) -> &mut Foo;
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}
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impl Ouch for Foo {
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fn ouch(x: &Foo) -> &mut Foo {
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unimplemented!()
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}
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}
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fn fail(x: &u32) -> &mut u16 {
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unimplemented!()
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}
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fn fail_lifetime<'a>(x: &'a u32, y: &mut u32) -> &'a mut u32 {
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unimplemented!()
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}
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fn fail_double<'a, 'b>(x: &'a u32, y: &'a u32, z: &'b mut u32) -> &'a mut u32 {
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unimplemented!()
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}
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// this is OK, because the result borrows y
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fn works<'a>(x: &u32, y: &'a mut u32) -> &'a mut u32 {
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unimplemented!()
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}
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// this is also OK, because the result could borrow y
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fn also_works<'a>(x: &'a u32, y: &'a mut u32) -> &'a mut u32 {
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unimplemented!()
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}
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fn main() {
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//TODO
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}
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