File: issue-53475.rs

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#![feature(coerce_unsized)]

use std::any::Any;
use std::ops::CoerceUnsized;

struct Foo<T> {
    data: Box<T>,
}

impl<T> CoerceUnsized<Foo<dyn Any>> for Foo<T> {}
//~^ ERROR the parameter type `T` may not live long enough

fn main() {}