1 files changed, 9 insertions, 0 deletions
diff --git a/src/test/ui/rfc-2126-extern-absolute-paths/not-allowed.rs b/src/test/ui/rfc-2126-extern-absolute-paths/not-allowed.rs
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index 000000000..acb4bbebe
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+++ b/src/test/ui/rfc-2126-extern-absolute-paths/not-allowed.rs
@@ -0,0 +1,9 @@
+// edition:2018
+
+// Tests that arbitrary crates (other than `core`, `std` and `meta`)
+// aren't allowed without `--extern`, even if they're in the sysroot.
+use alloc; //~ ERROR unresolved import `alloc`
+use test; // OK, imports the built-in attribute macro `#[test]`, but not the `test` crate.
+use proc_macro; // OK, imports the built-in `proc_macro` attribute, but not the `proc_macro` crate.
+
+fn main() {}