Allow trait methods to be called outside of generics

[cburgdorf]

What is wrong?

Currently traits are only useful when used with generics. But it should also be possible to use them like this:

pub struct Bar {}

impl SomeTrait for Bar {
  fn foo(&self) {
    ...
  }
}

trait SomeTrait {
    fn foo(&self);
}


...

    let bar: Bar = Bar();
    bar.foo();

How can it be fixed

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