rust/src/test/run-pass/issues/issue-43483.rs

// Copyright 2017 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.

// run-pass
trait VecN {
    const DIM: usize;
}

trait Mat {
    type Row: VecN;
}

fn m<M: Mat>() {
    let x = M::Row::DIM;
}

fn main() {}