Add a couple more tests

Add error annotations to one test

src/test/ui/imports/auxiliary/glob-conflict.rs

@@ -0,0 +1,9 @@
+mod m1 {
+    pub fn f() {}
+}
+mod m2 {
+    pub fn f(_: u8) {}
+}
+
+pub use m1::*;
+pub use m2::*;

src/test/ui/imports/glob-conflict-cross-crate.rs

@@ -0,0 +1,7 @@
+// aux-build:glob-conflict.rs
+
+extern crate glob_conflict;
+
+fn main() {
+    glob_conflict::f(); //~ ERROR cannot find function `f` in module `glob_conflict`
+}

src/test/ui/imports/glob-conflict-cross-crate.stderr

@@ -0,0 +1,9 @@
+error[E0425]: cannot find function `f` in module `glob_conflict`
+  --> $DIR/glob-conflict-cross-crate.rs:6:20
+   |
+LL |     glob_conflict::f(); //~ ERROR cannot find function `f` in module `glob_conflict`
+   |                    ^ not found in `glob_conflict`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0425`.

src/test/ui/rust-2018/local-path-suggestions-2018.rs

@@ -19,7 +19,7 @@ mod foo {
 }
 
 mod bazz {
-    use foo::Bar;
+    use foo::Bar; //~ ERROR unresolved import `foo`
 
     fn baz() {
         let x: Bar = 22;
@@ -28,6 +28,6 @@ mod bazz {
 
 use foo::Bar;
 
-use foobar::Baz;
+use foobar::Baz; //~ ERROR unresolved import `foobar`
 
 fn main() { }

src/test/ui/rust-2018/local-path-suggestions-2018.stderr

@@ -1,15 +1,15 @@
 error[E0432]: unresolved import `foo`
   --> $DIR/local-path-suggestions-2018.rs:22:9
    |
-LL |     use foo::Bar;
+LL |     use foo::Bar; //~ ERROR unresolved import `foo`
    |         ^^^ did you mean `crate::foo`?
    |
    = note: `use` statements changed in Rust 2018; read more at <https://doc.rust-lang.org/edition-guide/rust-2018/module-system/path-clarity.html>
 
 error[E0432]: unresolved import `foobar`
   --> $DIR/local-path-suggestions-2018.rs:31:5
    |
-LL | use foobar::Baz;
+LL | use foobar::Baz; //~ ERROR unresolved import `foobar`
    |     ^^^^^^ did you mean `baz::foobar`?
 
 error: aborting due to 2 previous errors

src/test/ui/rust-2018/uniform-paths/deadlock.rs

@@ -0,0 +1,7 @@
+// edition:2018
+// compile-flags:--extern foo --extern bar
+
+use foo::bar; //~ ERROR unresolved import
+use bar::foo;
+
+fn main() {}

src/test/ui/rust-2018/uniform-paths/deadlock.stderr

@@ -0,0 +1,9 @@
+error[E0432]: unresolved import
+  --> $DIR/deadlock.rs:4:5
+   |
+LL | use foo::bar; //~ ERROR unresolved import
+   |     ^^^^^^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0432`.

src/test/ui/rust-2018/uniform-paths/issue-54390.rs

@@ -0,0 +1,11 @@
+// edition:2018
+
+#![deny(unused)]
+
+use std::fmt;
+
+// No "unresolved import" + "unused import" combination here.
+use fmt::Write; //~ ERROR imports can only refer to extern crate names
+                //~| ERROR unused import: `fmt::Write`
+
+fn main() {}

src/test/ui/rust-2018/uniform-paths/issue-54390.stderr

@@ -0,0 +1,32 @@
+error[E0658]: imports can only refer to extern crate names passed with `--extern` on stable channel (see issue #53130)
+  --> $DIR/issue-54390.rs:8:5
+   |
+LL | use std::fmt;
+   |     -------- not an extern crate passed with `--extern`
+...
+LL | use fmt::Write; //~ ERROR imports can only refer to extern crate names
+   |     ^^^
+   |
+   = help: add #![feature(uniform_paths)] to the crate attributes to enable
+note: this import refers to the module imported here
+  --> $DIR/issue-54390.rs:5:5
+   |
+LL | use std::fmt;
+   |     ^^^^^^^^
+
+error: unused import: `fmt::Write`
+  --> $DIR/issue-54390.rs:8:5
+   |
+LL | use fmt::Write; //~ ERROR imports can only refer to extern crate names
+   |     ^^^^^^^^^^
+   |
+note: lint level defined here
+  --> $DIR/issue-54390.rs:3:9
+   |
+LL | #![deny(unused)]
+   |         ^^^^^^
+   = note: #[deny(unused_imports)] implied by #[deny(unused)]
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0658`.