1 files changed, 13 insertions, 0 deletions
diff --git a/tests/ui/proc-macro/issue-66286.rs b/tests/ui/proc-macro/issue-66286.rs
new file mode 100644
index 000000000..2a67aeab4
--- /dev/null
+++ b/tests/ui/proc-macro/issue-66286.rs
@@ -0,0 +1,13 @@
+// aux-build:issue-66286.rs
+
+// Regression test for #66286.
+
+extern crate issue_66286;
+
+#[issue_66286::vec_ice]
+pub extern fn foo(_: Vec(u32)) -> u32 {
+    //~^ ERROR: parenthesized type parameters may only be used with a `Fn` trait
+    0
+}
+
+fn main() {}