1 files changed, 21 insertions, 0 deletions
diff --git a/tests/ui/unused-crate-deps/libfib.rs b/tests/ui/unused-crate-deps/libfib.rs
new file mode 100644
index 00000000000..c1545dca99f
--- /dev/null
+++ b/tests/ui/unused-crate-deps/libfib.rs
@@ -0,0 +1,21 @@
+// Test warnings for a library crate
+
+// check-pass
+// aux-crate:bar=bar.rs
+// compile-flags:--crate-type lib -Wunused-crate-dependencies
+
+pub fn fib(n: u32) -> Vec<u32> {
+//~^ WARNING external crate `bar` unused in
+let mut prev = 0;
+    let mut cur = 1;
+    let mut v = vec![];
+
+    for _ in 0..n {
+        v.push(prev);
+        let n = prev + cur;
+        prev = cur;
+        cur = n;
+    }
+
+    v
+}