Rollup merge of #107700 - jyn514:tools-builder, r=Mark-Simulacrum

[rust.git] / tests / ui / mismatched_types / assignment-operator-unimplemented.rs

struct Foo;

fn main() {
  let mut a = Foo;
  let ref b = Foo;
  a += *b; //~ Error: binary assignment operation `+=` cannot be applied to type `Foo`
}