diff options
Diffstat (limited to 'tests/ui/borrowck/mut-borrow-of-mut-ref.rs')
-rw-r--r-- | tests/ui/borrowck/mut-borrow-of-mut-ref.rs | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/tests/ui/borrowck/mut-borrow-of-mut-ref.rs b/tests/ui/borrowck/mut-borrow-of-mut-ref.rs new file mode 100644 index 000000000..477a2aa48 --- /dev/null +++ b/tests/ui/borrowck/mut-borrow-of-mut-ref.rs @@ -0,0 +1,36 @@ +// Suggest not mutably borrowing a mutable reference +#![crate_type = "rlib"] + +pub fn f(b: &mut i32) { + //~^ ERROR cannot borrow + //~| NOTE not mutable + //~| NOTE the binding is already a mutable borrow + h(&mut b); + //~^ NOTE cannot borrow as mutable + //~| HELP try removing `&mut` here + g(&mut &mut b); + //~^ NOTE cannot borrow as mutable + //~| HELP try removing `&mut` here +} + +pub fn g(b: &mut i32) { //~ NOTE the binding is already a mutable borrow + h(&mut &mut b); + //~^ ERROR cannot borrow + //~| NOTE cannot borrow as mutable + //~| HELP try removing `&mut` here +} + +pub fn h(_: &mut i32) {} + +trait Foo { + fn bar(&mut self); +} + +impl Foo for &mut String { + fn bar(&mut self) {} +} + +pub fn baz(f: &mut String) { //~ HELP consider making the binding mutable + f.bar(); //~ ERROR cannot borrow `f` as mutable, as it is not declared as mutable + //~^ NOTE cannot borrow as mutable +} |