#[no_override] for default methods

[rust-highfive]

Issue by huonw
Monday Jul 08, 2013 at 14:16 GMT

For earlier discussion, see rust-lang/rust#7649

This issue was labelled with: A-attributes, B-RFC in the Rust repository

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If there was a #[no_override] attribute that made it impossible to override a default method, there would be very little need for the FooUtil traits (with this attribute default methods would have almost exactly the same properties as *Util, except the seperate trait can be imported separately). i.e.

trait Foo {
  fn bar(&self);

  #[no_override]
  fn call_bar(&self) { self.bar(); }
}
impl Foo for int {
  fn bar(&self) {}

  fn call_bar(&self) {} // error!
}

This would provide a workaround for #5898 that is a proper solution in its own right.