diff options
Diffstat (limited to 'src/tools/clippy/tests/ui/mut_from_ref.rs')
-rw-r--r-- | src/tools/clippy/tests/ui/mut_from_ref.rs | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/mut_from_ref.rs b/src/tools/clippy/tests/ui/mut_from_ref.rs new file mode 100644 index 000000000..370dbd588 --- /dev/null +++ b/src/tools/clippy/tests/ui/mut_from_ref.rs @@ -0,0 +1,54 @@ +#![allow(unused)] +#![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 +} |