1 files changed, 21 insertions, 0 deletions
diff --git a/tests/ui/generics/generic-non-trailing-defaults.stderr b/tests/ui/generics/generic-non-trailing-defaults.stderr
new file mode 100644
index 00000000000..713ba091b86
--- /dev/null
+++ b/tests/ui/generics/generic-non-trailing-defaults.stderr
@@ -0,0 +1,21 @@
+error: generic parameters with a default must be trailing
+  --> $DIR/generic-non-trailing-defaults.rs:3:12
+   |
+LL | struct Vec<A = Heap, T>(A, T);
+   |            ^
+
+error: generic parameters with a default must be trailing
+  --> $DIR/generic-non-trailing-defaults.rs:6:15
+   |
+LL | struct Foo<A, B = Vec<C>, C>(A, B, C);
+   |               ^
+
+error[E0128]: generic parameters with a default cannot use forward declared identifiers
+  --> $DIR/generic-non-trailing-defaults.rs:6:23
+   |
+LL | struct Foo<A, B = Vec<C>, C>(A, B, C);
+   |                       ^ defaulted generic parameters cannot be forward declared
+
+error: aborting due to 3 previous errors
+
+For more information about this error, try `rustc --explain E0128`.