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Change the algorithm in validate_terminates #1220

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@jhjourdan this is what we talked about.

The new algorithm is stricter:

trait Foo {
    fn foo1();
    fn foo2();
}

impl Foo for i32 {
    fn foo1() {}
    fn foo2() { g() }
}

fn f<T: Foo>() { <T as Foo>::foo1() }
fn g() { f::<i32>(); }

is now rejected, saying that f might call i32::foo2 because of the T: Foo bound.

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