File: trait-bounds-cant-coerce.rs

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rustc 1.70.0%2Bdfsg1-9
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trait Foo {
    fn dummy(&self) { }
}

fn a(_x: Box<dyn Foo + Send>) {
}

fn c(x: Box<dyn Foo + Sync + Send>) {
    a(x);
}

fn d(x: Box<dyn Foo>) {
    a(x); //~ ERROR mismatched types [E0308]
}

fn main() { }