issue-39569.rs

// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

// Regression test for a weird corner case in our dep-graph reduction
// code. When we solve `CoerceUnsized<Foo>`, we find no impls, so we
// don't end up with an edge to any HIR nodes, but it still gets
// preserved in the dep graph.

// revisions:rpass1 rpass2
// compile-flags: -Z query-dep-graph

use std::sync::Arc;

#[cfg(rpass1)]
struct Foo { x: usize }

#[cfg(rpass1)]
fn main() {
    let x: Arc<Foo> = Arc::new(Foo { x: 22 });
    let y: Arc<Foo> = x;
}

#[cfg(rpass2)]
struct FooX { x: usize }

#[cfg(rpass2)]
fn main() {
    let x: Arc<FooX> = Arc::new(FooX { x: 22 });
    let y: Arc<FooX> = x;
}