Better support for import resolution in 3 namespaces

src/test/ui/issue-50187.rs

@@ -0,0 +1,49 @@
+// 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.
+
+// compile-pass
+
+#![feature(use_extern_macros, decl_macro)]
+
+mod type_ns {
+    pub type A = u8;
+}
+mod value_ns {
+    pub const A: u8 = 0;
+}
+mod macro_ns {
+    pub macro A() {}
+}
+
+mod merge2 {
+    pub use type_ns::A;
+    pub use value_ns::A;
+}
+mod merge3 {
+    pub use type_ns::A;
+    pub use value_ns::A;
+    pub use macro_ns::A;
+}
+
+mod use2 {
+    pub use merge2::A;
+}
+mod use3 {
+    pub use merge3::A;
+}
+
+fn main() {
+    type B2 = use2::A;
+    let a2 = use2::A;
+
+    type B3 = use3::A;
+    let a3 = use3::A;
+    use3::A!();
+}