mirror of https://github.com/rust-lang/rust
37 lines
928 B
Rust
37 lines
928 B
Rust
// Suggest not mutably borrowing a mutable reference
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#![crate_type = "rlib"]
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pub fn f(b: &mut i32) {
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//~^ ERROR cannot borrow
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//~| NOTE not mutable
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//~| NOTE the binding is already a mutable borrow
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h(&mut b);
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//~^ NOTE cannot borrow as mutable
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//~| HELP try removing `&mut` here
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g(&mut &mut b);
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//~^ NOTE cannot borrow as mutable
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//~| HELP try removing `&mut` here
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}
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pub fn g(b: &mut i32) { //~ NOTE the binding is already a mutable borrow
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h(&mut &mut b);
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//~^ ERROR cannot borrow
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//~| NOTE cannot borrow as mutable
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//~| HELP try removing `&mut` here
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}
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pub fn h(_: &mut i32) {}
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trait Foo {
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fn bar(&mut self);
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}
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impl Foo for &mut String {
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fn bar(&mut self) {}
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}
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pub fn baz(f: &mut String) { //~ HELP consider making the binding mutable
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f.bar(); //~ ERROR cannot borrow `f` as mutable, as it is not declared as mutable
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//~^ NOTE cannot borrow as mutable
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}
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