File: E0033-teach.rs

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// compile-flags: -Z teach
trait SomeTrait {
    fn foo(&self);
}
struct S;
impl SomeTrait for S {
    fn foo(&self) {}
}
fn main() {
    let trait_obj: &dyn SomeTrait = &S;

    let &invalid = trait_obj;
    //~^ ERROR E0033
}