// issue: rust-lang/rust#19538 trait Foo { fn foo(&self, val: T); } trait Bar: Foo { } pub struct Thing; impl Foo for Thing { fn foo(&self, val: T) { } } impl Bar for Thing { } fn main() { let mut thing = Thing; let test: &mut dyn Bar = &mut thing; //~^ ERROR E0038 //~| ERROR E0038 }