1 files changed, 16 insertions, 0 deletions
diff --git a/src/test/ui/parser/trait-object-bad-parens.rs b/src/test/ui/parser/trait-object-bad-parens.rs
new file mode 100644
index 000000000..8e267c744
--- /dev/null
+++ b/src/test/ui/parser/trait-object-bad-parens.rs
@@ -0,0 +1,16 @@
+#![feature(auto_traits)]
+#![feature(negative_impls)]
+#![allow(bare_trait_objects)]
+
+auto trait Auto {}
+
+fn main() {
+    let _: Box<((Auto)) + Auto>;
+    //~^ ERROR expected a path on the left-hand side of `+`, not `((Auto))`
+    let _: Box<(Auto + Auto) + Auto>;
+    //~^ ERROR expected a path on the left-hand side of `+`, not `(Auto + Auto)`
+    let _: Box<(Auto +) + Auto>;
+    //~^ ERROR expected a path on the left-hand side of `+`, not `(Auto)`
+    let _: Box<(dyn Auto) + Auto>;
+    //~^ ERROR expected a path on the left-hand side of `+`, not `(dyn Auto)`
+}