| #![allow(unused, clippy::needless_lifetimes, clippy::needless_pass_by_ref_mut)] |
| #![warn(clippy::mut_from_ref)] |
| |
| struct Foo; |
| |
| impl Foo { |
| fn this_wont_hurt_a_bit(&self) -> &mut Foo { |
| unsafe { unimplemented!() } |
| } |
| } |
| |
| trait Ouch { |
| fn ouch(x: &Foo) -> &mut Foo; |
| } |
| |
| impl Ouch for Foo { |
| fn ouch(x: &Foo) -> &mut Foo { |
| unsafe { unimplemented!() } |
| } |
| } |
| |
| fn fail(x: &u32) -> &mut u16 { |
| unsafe { unimplemented!() } |
| } |
| |
| fn fail_lifetime<'a>(x: &'a u32, y: &mut u32) -> &'a mut u32 { |
| unsafe { unimplemented!() } |
| } |
| |
| fn fail_double<'a, 'b>(x: &'a u32, y: &'a u32, z: &'b mut u32) -> &'a mut u32 { |
| unsafe { unimplemented!() } |
| } |
| |
| // this is OK, because the result borrows y |
| fn works<'a>(x: &u32, y: &'a mut u32) -> &'a mut u32 { |
| unsafe { unimplemented!() } |
| } |
| |
| // this is also OK, because the result could borrow y |
| fn also_works<'a>(x: &'a u32, y: &'a mut u32) -> &'a mut u32 { |
| unsafe { unimplemented!() } |
| } |
| |
| unsafe fn also_broken(x: &u32) -> &mut u32 { |
| unimplemented!() |
| } |
| |
| fn without_unsafe(x: &u32) -> &mut u32 { |
| unimplemented!() |
| } |
| |
| fn main() { |
| //TODO |
| } |