diff options
Diffstat (limited to 'tests/ui/objects-coerce-freeze-borrored.rs')
-rw-r--r-- | tests/ui/objects-coerce-freeze-borrored.rs | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/tests/ui/objects-coerce-freeze-borrored.rs b/tests/ui/objects-coerce-freeze-borrored.rs new file mode 100644 index 000000000..704d77480 --- /dev/null +++ b/tests/ui/objects-coerce-freeze-borrored.rs @@ -0,0 +1,40 @@ +// run-pass +// Test that we can coerce an `@Object` to an `&Object` + + +trait Foo { + fn foo(&self) -> usize; + fn bar(&mut self) -> usize; +} + +impl Foo for usize { + fn foo(&self) -> usize { + *self + } + + fn bar(&mut self) -> usize { + *self += 1; + *self + } +} + +fn do_it_mut(obj: &mut dyn Foo) { + let x = obj.bar(); + let y = obj.foo(); + assert_eq!(x, y); + + do_it_imm(obj, y); +} + +fn do_it_imm(obj: &dyn Foo, v: usize) { + let y = obj.foo(); + assert_eq!(v, y); +} + +pub fn main() { + let mut x: usize = 22; + let obj = &mut x as &mut dyn Foo; + do_it_mut(obj); + do_it_imm(obj, 23); + do_it_mut(obj); +} |