1 files changed, 19 insertions, 0 deletions
diff --git a/src/test/ui/hygiene/duplicate_lifetimes.rs b/src/test/ui/hygiene/duplicate_lifetimes.rs
new file mode 100644
index 000000000..8971fb626
--- /dev/null
+++ b/src/test/ui/hygiene/duplicate_lifetimes.rs
@@ -0,0 +1,19 @@
+// Ensure that lifetime parameter names are modernized before we check for
+// duplicates.
+
+#![feature(decl_macro, rustc_attrs)]
+
+#[rustc_macro_transparency = "semitransparent"]
+macro m($a:lifetime) {
+    fn g<$a, 'a>() {} //~ ERROR the name `'a` is already used for a generic parameter
+}
+
+#[rustc_macro_transparency = "transparent"]
+macro n($a:lifetime) {
+    fn h<$a, 'a>() {} //~ ERROR the name `'a` is already used for a generic parameter
+}
+
+m!('a);
+n!('a);
+
+fn main() {}