6 files changed, 90 insertions, 11 deletions
diff --git a/src/test/ui/lint/lint-unused-imports.rs b/src/test/ui/lint/lint-unused-imports.rs
index 9c5b206203c..4754d888076 100644
--- a/src/test/ui/lint/lint-unused-imports.rs
+++ b/src/test/ui/lint/lint-unused-imports.rs
@@ -66,6 +66,7 @@ mod bar {
 
 fn g() {
     use self::g; //~ ERROR unused import: `self::g`
+    //~^ ERROR the item `g` is imported redundantly
     fn f() {
         self::g();
     }
@@ -75,6 +76,7 @@ fn g() {
 #[allow(unused_variables)]
 fn h() {
     use test2::foo; //~ ERROR unused import: `test2::foo`
+    //~^ ERROR the item `foo` is imported redundantly
     let foo = 0;
 }
 
diff --git a/src/test/ui/lint/lint-unused-imports.stderr b/src/test/ui/lint/lint-unused-imports.stderr
index f9a54f477f9..96d71a228a5 100644
--- a/src/test/ui/lint/lint-unused-imports.stderr
+++ b/src/test/ui/lint/lint-unused-imports.stderr
@@ -34,14 +34,36 @@ error: unused import: `foo::Square`
 LL |         use foo::Square;
    |             ^^^^^^^^^^^
 
+error: the item `g` is imported redundantly
+  --> $DIR/lint-unused-imports.rs:68:9
+   |
+LL | / fn g() {
+LL | |     use self::g;
+   | |         ^^^^^^^
+LL | |
+LL | |     fn f() {
+LL | |         self::g();
+LL | |     }
+LL | | }
+   | |_- the item `g` is already defined here
+
 error: unused import: `self::g`
   --> $DIR/lint-unused-imports.rs:68:9
    |
 LL |     use self::g;
    |         ^^^^^^^
 
+error: the item `foo` is imported redundantly
+  --> $DIR/lint-unused-imports.rs:78:9
+   |
+LL | use test2::{foo, bar};
+   |             --- the item `foo` is already imported here
+...
+LL |     use test2::foo;
+   |         ^^^^^^^^^^
+
 error: unused import: `test2::foo`
-  --> $DIR/lint-unused-imports.rs:77:9
+  --> $DIR/lint-unused-imports.rs:78:9
    |
 LL |     use test2::foo;
    |         ^^^^^^^^^^
@@ -52,5 +74,5 @@ error: unused import: `test::B2`
 LL | use test::B2;
    |     ^^^^^^^^
 
-error: aborting due to 8 previous errors
+error: aborting due to 10 previous errors
 
diff --git a/src/test/ui/lint/use-redundant.rs b/src/test/ui/lint/use-redundant.rs
new file mode 100644
index 00000000000..328f8232baf
--- /dev/null
+++ b/src/test/ui/lint/use-redundant.rs
@@ -0,0 +1,27 @@
+// compile-pass
+#![warn(unused_imports)]
+
+use crate::foo::Bar; //~ WARNING first import
+
+mod foo {
+    pub type Bar = i32;
+}
+
+fn baz() -> Bar {
+    3
+}
+
+mod m1 { pub struct S {} }
+mod m2 { pub struct S {} }
+
+use m1::*;
+use m2::*;
+
+fn main() {
+    use crate::foo::Bar; //~ WARNING redundant import
+    let _a: Bar = 3;
+    baz();
+
+    use m1::S; //~ WARNING redundant import
+    let _s = S {};
+}
diff --git a/src/test/ui/lint/use-redundant.stderr b/src/test/ui/lint/use-redundant.stderr
new file mode 100644
index 00000000000..fbd9f81f18f
--- /dev/null
+++ b/src/test/ui/lint/use-redundant.stderr
@@ -0,0 +1,27 @@
+warning: unused import: `m1::*`
+  --> $DIR/use-redundant.rs:17:5
+   |
+LL | use m1::*;
+   |     ^^^^^
+   |
+note: lint level defined here
+  --> $DIR/use-redundant.rs:2:9
+   |
+LL | #![warn(unused_imports)]
+   |         ^^^^^^^^^^^^^^
+
+warning: unused import: `m2::*`
+  --> $DIR/use-redundant.rs:18:5
+   |
+LL | use m2::*;
+   |     ^^^^^
+
+warning: the item `Bar` is imported redundantly
+  --> $DIR/use-redundant.rs:21:9
+   |
+LL | use crate::foo::Bar;
+   |     --------------- the item `Bar` is already imported here
+...
+LL |     use crate::foo::Bar;
+   |         ^^^^^^^^^^^^^^^
+
diff --git a/src/test/ui/rust-2018/future-proofing-locals.rs b/src/test/ui/rust-2018/future-proofing-locals.rs
index 1e53c2d1dac..2c388cf3713 100644
--- a/src/test/ui/rust-2018/future-proofing-locals.rs
+++ b/src/test/ui/rust-2018/future-proofing-locals.rs
@@ -1,6 +1,7 @@
 // edition:2018
 
 #![allow(non_camel_case_types)]
+#![allow(unused_imports)]
 
 mod T {
     pub struct U;
diff --git a/src/test/ui/rust-2018/future-proofing-locals.stderr b/src/test/ui/rust-2018/future-proofing-locals.stderr
index 4d666d22afe..7021489a6dd 100644
--- a/src/test/ui/rust-2018/future-proofing-locals.stderr
+++ b/src/test/ui/rust-2018/future-proofing-locals.stderr
@@ -1,53 +1,53 @@
 error: imports cannot refer to type parameters
-  --> $DIR/future-proofing-locals.rs:13:9
+  --> $DIR/future-proofing-locals.rs:14:9
    |
 LL |     use T as _;
    |         ^
 
 error: imports cannot refer to type parameters
-  --> $DIR/future-proofing-locals.rs:14:9
+  --> $DIR/future-proofing-locals.rs:15:9
    |
 LL |     use T::U;
    |         ^
 
 error: imports cannot refer to type parameters
-  --> $DIR/future-proofing-locals.rs:15:9
+  --> $DIR/future-proofing-locals.rs:16:9
    |
 LL |     use T::*;
    |         ^
 
 error: imports cannot refer to type parameters
-  --> $DIR/future-proofing-locals.rs:19:9
+  --> $DIR/future-proofing-locals.rs:20:9
    |
 LL |     use T;
    |         ^
 
 error: imports cannot refer to local variables
-  --> $DIR/future-proofing-locals.rs:25:9
+  --> $DIR/future-proofing-locals.rs:26:9
    |
 LL |     use x as _;
    |         ^
 
 error: imports cannot refer to local variables
-  --> $DIR/future-proofing-locals.rs:31:9
+  --> $DIR/future-proofing-locals.rs:32:9
    |
 LL |     use x;
    |         ^
 
 error: imports cannot refer to local variables
-  --> $DIR/future-proofing-locals.rs:37:17
+  --> $DIR/future-proofing-locals.rs:38:17
    |
 LL |             use x;
    |                 ^
 
 error: imports cannot refer to type parameters
-  --> $DIR/future-proofing-locals.rs:45:10
+  --> $DIR/future-proofing-locals.rs:46:10
    |
 LL |     use {T as _, x};
    |          ^
 
 error: imports cannot refer to local variables
-  --> $DIR/future-proofing-locals.rs:45:18
+  --> $DIR/future-proofing-locals.rs:46:18
    |
 LL |     use {T as _, x};
    |                  ^