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diff --git a/src/test/ui/run-pass/uniform-paths/macros-nested.rs b/src/test/ui/run-pass/uniform-paths/macros-nested.rs
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+// Copyright 2018 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.
+
+// edition:2018
+
+#![feature(uniform_paths)]
+
+// This test is similar to `macros.rs`, but nested in modules.
+
+mod foo {
+    // Test that ambiguity errors are not emitted between `self::test` and
+    // `::test`, assuming the latter (crate) is not in `extern_prelude`.
+    macro_rules! m1 {
+        () => {
+            mod test {
+                pub struct Foo(pub ());
+            }
+        }
+    }
+    pub use test::Foo;
+    m1!();
+
+    // Test that qualified paths can refer to both the external crate and local item.
+    macro_rules! m2 {
+        () => {
+            mod std {
+                pub struct io(pub ());
+            }
+        }
+    }
+    pub use ::std::io as std_io;
+    pub use self::std::io as local_io;
+    m2!();
+}
+
+// Test that we can refer to the external crate unqualified
+// (when there isn't a local item with the same name).
+use std::io;
+
+mod bar {
+    // Also test the unqualified external crate import in a nested module,
+    // to show that the above import doesn't resolve through a local `std`
+    // item, e.g. the automatically injected `extern crate std;`, which in
+    // the Rust 2018 should no longer be visible through `crate::std`.
+    pub use std::io;
+}
+
+
+fn main() {
+    foo::Foo(());
+    foo::std_io::stdout();
+    foo::local_io(());
+    io::stdout();
+    bar::io::stdout();
+}