File: feature-gate-do_not_recommend.rs

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#![feature(do_not_recommend)]

pub trait Foo {
}

impl Foo for i32 {
}

pub trait Bar {
}

#[do_not_recommend]
impl<T: Foo> Bar for T {
}

fn stuff<T: Bar>(_: T) {}

fn main() {
    stuff(1u8);
    //~^ the trait bound `u8: Foo` is not satisfied
}