rustc/tests/ui/feature-gates/feature-gate-multiple_supertrait_upcastable.rs

//@ check-pass

#![deny(multiple_supertrait_upcastable)]
//~^ WARNING unknown lint: `multiple_supertrait_upcastable`
#![warn(multiple_supertrait_upcastable)]
//~^ WARNING unknown lint: `multiple_supertrait_upcastable`

fn main() {}