| #![allow(unused_variables, dead_code)] |
| //@no-rustfix |
| fn takes_an_immutable_reference(a: &i32) {} |
| fn takes_a_mutable_reference(a: &mut i32) {} |
| |
| mod issue11268 { |
| macro_rules! x { |
| ($f:expr) => { |
| $f(&mut 1); |
| }; |
| } |
| |
| fn f() { |
| x!(super::takes_an_immutable_reference); |
| x!(super::takes_a_mutable_reference); |
| } |
| } |
| |
| struct MyStruct; |
| |
| impl MyStruct { |
| fn takes_an_immutable_reference(&self, a: &i32) {} |
| |
| fn takes_a_mutable_reference(&self, a: &mut i32) {} |
| } |
| |
| #[warn(clippy::unnecessary_mut_passed)] |
| fn main() { |
| // Functions |
| takes_an_immutable_reference(&mut 42); |
| //~^ ERROR: the function `takes_an_immutable_reference` doesn't need a mutable referen |
| //~| NOTE: `-D clippy::unnecessary-mut-passed` implied by `-D warnings` |
| let as_ptr: fn(&i32) = takes_an_immutable_reference; |
| as_ptr(&mut 42); |
| //~^ ERROR: the function `as_ptr` doesn't need a mutable reference |
| |
| // Methods |
| let my_struct = MyStruct; |
| my_struct.takes_an_immutable_reference(&mut 42); |
| //~^ ERROR: the method `takes_an_immutable_reference` doesn't need a mutable reference |
| |
| // No error |
| |
| // Functions |
| takes_an_immutable_reference(&42); |
| let as_ptr: fn(&i32) = takes_an_immutable_reference; |
| as_ptr(&42); |
| |
| takes_a_mutable_reference(&mut 42); |
| let as_ptr: fn(&mut i32) = takes_a_mutable_reference; |
| as_ptr(&mut 42); |
| |
| let a = &mut 42; |
| takes_an_immutable_reference(a); |
| |
| // Methods |
| my_struct.takes_an_immutable_reference(&42); |
| my_struct.takes_a_mutable_reference(&mut 42); |
| my_struct.takes_an_immutable_reference(a); |
| } |