10 files changed, 204 insertions, 0 deletions
diff --git a/tests/ui/unresolved/unresolved-asterisk-imports.rs b/tests/ui/unresolved/unresolved-asterisk-imports.rs
new file mode 100644
index 000000000..2d853a66c
--- /dev/null
+++ b/tests/ui/unresolved/unresolved-asterisk-imports.rs
@@ -0,0 +1,4 @@
+use not_existing_crate::*; //~ ERROR unresolved import `not_existing_crate
+use std as foo;
+
+fn main() {}
diff --git a/tests/ui/unresolved/unresolved-asterisk-imports.stderr b/tests/ui/unresolved/unresolved-asterisk-imports.stderr
new file mode 100644
index 000000000..8df8eab34
--- /dev/null
+++ b/tests/ui/unresolved/unresolved-asterisk-imports.stderr
@@ -0,0 +1,11 @@
+error[E0432]: unresolved import `not_existing_crate`
+  --> $DIR/unresolved-asterisk-imports.rs:1:5
+   |
+LL | use not_existing_crate::*;
+   |     ^^^^^^^^^^^^^^^^^^ maybe a missing crate `not_existing_crate`?
+   |
+   = help: consider adding `extern crate not_existing_crate` to use the `not_existing_crate` crate
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0432`.
diff --git a/tests/ui/unresolved/unresolved-candidates.rs b/tests/ui/unresolved/unresolved-candidates.rs
new file mode 100644
index 000000000..38b227f60
--- /dev/null
+++ b/tests/ui/unresolved/unresolved-candidates.rs
@@ -0,0 +1,13 @@
+mod a {
+    pub trait Trait {}
+}
+
+mod b {
+    use Trait; //~ ERROR unresolved import `Trait`
+}
+
+mod c {
+    impl Trait for () {} //~ ERROR cannot find trait `Trait` in this scope
+}
+
+fn main() {}
diff --git a/tests/ui/unresolved/unresolved-candidates.stderr b/tests/ui/unresolved/unresolved-candidates.stderr
new file mode 100644
index 000000000..ea737c567
--- /dev/null
+++ b/tests/ui/unresolved/unresolved-candidates.stderr
@@ -0,0 +1,26 @@
+error[E0432]: unresolved import `Trait`
+  --> $DIR/unresolved-candidates.rs:6:9
+   |
+LL |     use Trait;
+   |         ^^^^^ no `Trait` in the root
+   |
+help: consider importing this trait instead
+   |
+LL |     use a::Trait;
+   |         ~~~~~~~~
+
+error[E0405]: cannot find trait `Trait` in this scope
+  --> $DIR/unresolved-candidates.rs:10:10
+   |
+LL |     impl Trait for () {}
+   |          ^^^^^ not found in this scope
+   |
+help: consider importing this trait
+   |
+LL |     use a::Trait;
+   |
+
+error: aborting due to 2 previous errors
+
+Some errors have detailed explanations: E0405, E0432.
+For more information about an error, try `rustc --explain E0405`.
diff --git a/tests/ui/unresolved/unresolved-extern-mod-suggestion.rs b/tests/ui/unresolved/unresolved-extern-mod-suggestion.rs
new file mode 100644
index 000000000..a1bf0f210
--- /dev/null
+++ b/tests/ui/unresolved/unresolved-extern-mod-suggestion.rs
@@ -0,0 +1,5 @@
+extern crate core;
+use core;
+//~^ ERROR the name `core` is defined multiple times
+
+fn main() {}
diff --git a/tests/ui/unresolved/unresolved-extern-mod-suggestion.stderr b/tests/ui/unresolved/unresolved-extern-mod-suggestion.stderr
new file mode 100644
index 000000000..28333228a
--- /dev/null
+++ b/tests/ui/unresolved/unresolved-extern-mod-suggestion.stderr
@@ -0,0 +1,13 @@
+error[E0254]: the name `core` is defined multiple times
+  --> $DIR/unresolved-extern-mod-suggestion.rs:2:5
+   |
+LL | extern crate core;
+   | ------------------ previous import of the extern crate `core` here
+LL | use core;
+   |     ^^^^ `core` reimported here
+   |
+   = note: `core` must be defined only once in the type namespace of this module
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0254`.
diff --git a/tests/ui/unresolved/unresolved-import-recovery.rs b/tests/ui/unresolved/unresolved-import-recovery.rs
new file mode 100644
index 000000000..0b0653378
--- /dev/null
+++ b/tests/ui/unresolved/unresolved-import-recovery.rs
@@ -0,0 +1,17 @@
+// Check that unresolved imports do not create additional errors and ICEs
+
+mod m {
+    pub use unresolved; //~ ERROR unresolved import `unresolved`
+
+    fn f() {
+        let unresolved = 0; // OK
+    }
+}
+
+fn main() {
+    match 0u8 {
+        m::unresolved => {} // OK
+        m::unresolved(..) => {} // OK
+        m::unresolved{..} => {} // OK
+    }
+}
diff --git a/tests/ui/unresolved/unresolved-import-recovery.stderr b/tests/ui/unresolved/unresolved-import-recovery.stderr
new file mode 100644
index 000000000..5e371b70b
--- /dev/null
+++ b/tests/ui/unresolved/unresolved-import-recovery.stderr
@@ -0,0 +1,9 @@
+error[E0432]: unresolved import `unresolved`
+  --> $DIR/unresolved-import-recovery.rs:4:13
+   |
+LL |     pub use unresolved;
+   |             ^^^^^^^^^^ no `unresolved` in the root
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0432`.
diff --git a/tests/ui/unresolved/unresolved-import.rs b/tests/ui/unresolved/unresolved-import.rs
new file mode 100644
index 000000000..4125c593c
--- /dev/null
+++ b/tests/ui/unresolved/unresolved-import.rs
@@ -0,0 +1,56 @@
+use foo::bar; //~ ERROR unresolved import `foo` [E0432]
+              //~^ maybe a missing crate `foo`?
+              //~| HELP consider adding `extern crate foo` to use the `foo` crate
+
+use bar::Baz as x; //~ ERROR unresolved import `bar::Baz` [E0432]
+                   //~| no `Baz` in `bar`
+                   //~| HELP a similar name exists in the module
+                   //~| SUGGESTION Bar
+
+use food::baz; //~ ERROR unresolved import `food::baz`
+               //~| no `baz` in `food`
+               //~| HELP a similar name exists in the module
+               //~| SUGGESTION bag
+
+use food::{beens as Foo}; //~ ERROR unresolved import `food::beens` [E0432]
+                          //~| no `beens` in `food`
+                          //~| HELP a similar name exists in the module
+                          //~| SUGGESTION beans
+
+mod bar {
+    pub struct Bar;
+}
+
+mod food {
+    pub use self::zug::baz::{self as bag, Foobar as beans};
+
+    mod zug {
+        pub mod baz {
+            pub struct Foobar;
+        }
+    }
+}
+
+mod m {
+    enum MyEnum {
+        MyVariant
+    }
+
+    use MyEnum::*; //~ ERROR unresolved import `MyEnum` [E0432]
+                   //~| HELP a similar path exists
+                   //~| SUGGESTION self::MyEnum
+}
+
+mod items {
+    enum Enum {
+        Variant
+    }
+
+    use Enum::*; //~ ERROR unresolved import `Enum` [E0432]
+                 //~| HELP a similar path exists
+                 //~| SUGGESTION self::Enum
+
+    fn item() {}
+}
+
+fn main() {}
diff --git a/tests/ui/unresolved/unresolved-import.stderr b/tests/ui/unresolved/unresolved-import.stderr
new file mode 100644
index 000000000..0dd928c8b
--- /dev/null
+++ b/tests/ui/unresolved/unresolved-import.stderr
@@ -0,0 +1,50 @@
+error[E0432]: unresolved import `foo`
+  --> $DIR/unresolved-import.rs:1:5
+   |
+LL | use foo::bar;
+   |     ^^^ maybe a missing crate `foo`?
+   |
+   = help: consider adding `extern crate foo` to use the `foo` crate
+
+error[E0432]: unresolved import `bar::Baz`
+  --> $DIR/unresolved-import.rs:5:5
+   |
+LL | use bar::Baz as x;
+   |     ^^^^^---^^^^^
+   |     |    |
+   |     |    help: a similar name exists in the module: `Bar`
+   |     no `Baz` in `bar`
+
+error[E0432]: unresolved import `food::baz`
+  --> $DIR/unresolved-import.rs:10:5
+   |
+LL | use food::baz;
+   |     ^^^^^^---
+   |     |     |
+   |     |     help: a similar name exists in the module: `bag`
+   |     no `baz` in `food`
+
+error[E0432]: unresolved import `food::beens`
+  --> $DIR/unresolved-import.rs:15:12
+   |
+LL | use food::{beens as Foo};
+   |            -----^^^^^^^
+   |            |
+   |            no `beens` in `food`
+   |            help: a similar name exists in the module: `beans`
+
+error[E0432]: unresolved import `MyEnum`
+  --> $DIR/unresolved-import.rs:39:9
+   |
+LL |     use MyEnum::*;
+   |         ^^^^^^ help: a similar path exists: `self::MyEnum`
+
+error[E0432]: unresolved import `Enum`
+  --> $DIR/unresolved-import.rs:49:9
+   |
+LL |     use Enum::*;
+   |         ^^^^ help: a similar path exists: `self::Enum`
+
+error: aborting due to 6 previous errors
+
+For more information about this error, try `rustc --explain E0432`.