mirror of https://github.com/rust-lang/rust.git
50 lines
1.3 KiB
Rust
50 lines
1.3 KiB
Rust
#![feature(plugin)]
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#![plugin(clippy)]
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#![allow(unused_variables)]
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fn takes_an_immutable_reference(a: &i32) {}
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fn takes_a_mutable_reference(a: &mut i32) {}
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struct MyStruct;
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impl MyStruct {
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fn takes_an_immutable_reference(&self, a: &i32) {
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}
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fn takes_a_mutable_reference(&self, a: &mut i32) {
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}
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}
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#[deny(unnecessary_mut_passed)]
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fn main() {
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// Functions
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takes_an_immutable_reference(&mut 42); //~ERROR The function/method "takes_an_immutable_reference" doesn't need a mutable reference
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let as_ptr: fn(&i32) = takes_an_immutable_reference;
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as_ptr(&mut 42); //~ERROR The function/method "as_ptr" doesn't need a mutable reference
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// Methods
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let my_struct = MyStruct;
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my_struct.takes_an_immutable_reference(&mut 42); //~ERROR The function/method "takes_an_immutable_reference" doesn't need a mutable reference
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// No error
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// Functions
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takes_an_immutable_reference(&42);
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let as_ptr: fn(&i32) = takes_an_immutable_reference;
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as_ptr(&42);
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takes_a_mutable_reference(&mut 42);
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let as_ptr: fn(&mut i32) = takes_a_mutable_reference;
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as_ptr(&mut 42);
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let a = &mut 42;
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takes_an_immutable_reference(a);
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// Methods
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my_struct.takes_an_immutable_reference(&42);
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my_struct.takes_a_mutable_reference(&mut 42);
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my_struct.takes_an_immutable_reference(a);
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}
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