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#![feature(rustc_attrs)] trait A { fn foo_a(&self) {} } trait B { fn foo_b(&self) {} } trait C: A + B { fn foo_c(&self) {} } struct S; #[rustc_dump_vtable] impl A for S {} //~^ error vtable #[rustc_dump_vtable] impl B for S {} //~^ error vtable #[rustc_dump_vtable] impl C for S {} //~^ error vtable fn main() {}