error: mutable borrow from immutable input(s) --> $DIR/mut_from_ref.rs:9:39 | 9 | fn this_wont_hurt_a_bit(&self) -> &mut Foo { | ^^^^^^^^ | = note: `-D mut-from-ref` implied by `-D warnings` note: immutable borrow here --> $DIR/mut_from_ref.rs:9:29 | 9 | fn this_wont_hurt_a_bit(&self) -> &mut Foo { | ^^^^^ error: mutable borrow from immutable input(s) --> $DIR/mut_from_ref.rs:15:25 | 15 | fn ouch(x: &Foo) -> &mut Foo; | ^^^^^^^^ | note: immutable borrow here --> $DIR/mut_from_ref.rs:15:16 | 15 | fn ouch(x: &Foo) -> &mut Foo; | ^^^^ error: mutable borrow from immutable input(s) --> $DIR/mut_from_ref.rs:24:21 | 24 | fn fail(x: &u32) -> &mut u16 { | ^^^^^^^^ | note: immutable borrow here --> $DIR/mut_from_ref.rs:24:12 | 24 | fn fail(x: &u32) -> &mut u16 { | ^^^^ error: mutable borrow from immutable input(s) --> $DIR/mut_from_ref.rs:28:50 | 28 | fn fail_lifetime<'a>(x: &'a u32, y: &mut u32) -> &'a mut u32 { | ^^^^^^^^^^^ | note: immutable borrow here --> $DIR/mut_from_ref.rs:28:25 | 28 | fn fail_lifetime<'a>(x: &'a u32, y: &mut u32) -> &'a mut u32 { | ^^^^^^^ error: mutable borrow from immutable input(s) --> $DIR/mut_from_ref.rs:32:67 | 32 | fn fail_double<'a, 'b>(x: &'a u32, y: &'a u32, z: &'b mut u32) -> &'a mut u32 { | ^^^^^^^^^^^ | note: immutable borrow here --> $DIR/mut_from_ref.rs:32:27 | 32 | fn fail_double<'a, 'b>(x: &'a u32, y: &'a u32, z: &'b mut u32) -> &'a mut u32 { | ^^^^^^^ ^^^^^^^ error: aborting due to 5 previous errors