1 files changed, 24 insertions, 0 deletions
diff --git a/tests/ui/extern/extern-crate-visibility.rs b/tests/ui/extern/extern-crate-visibility.rs
new file mode 100644
index 00000000000..cda1227cc8e
--- /dev/null
+++ b/tests/ui/extern/extern-crate-visibility.rs
@@ -0,0 +1,24 @@
+mod foo {
+    extern crate core;
+}
+
+// Check that private crates can be used from outside their modules, albeit with warnings
+use foo::core::cell; //~ ERROR crate import `core` is private
+
+fn f() {
+    foo::core::cell::Cell::new(0); //~ ERROR crate import `core` is private
+
+    use foo::*;
+    mod core {} // Check that private crates are not glob imported
+}
+
+mod bar {
+    pub extern crate core;
+}
+
+mod baz {
+    pub use bar::*;
+    use self::core::cell; // Check that public extern crates are glob imported
+}
+
+fn main() {}