1 files changed, 29 insertions, 0 deletions
diff --git a/src/test/ui/type-alias-impl-trait/generic_nondefining_use.rs b/src/test/ui/type-alias-impl-trait/generic_nondefining_use.rs
new file mode 100644
index 000000000..f39741a6a
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/generic_nondefining_use.rs
@@ -0,0 +1,29 @@
+#![feature(type_alias_impl_trait)]
+
+use std::fmt::Debug;
+
+fn main() {}
+
+type OneTy<T> = impl Debug;
+
+type OneLifetime<'a> = impl Debug;
+
+type OneConst<const X: usize> = impl Debug;
+
+
+// Not defining uses, because they doesn't define *all* possible generics.
+
+fn concrete_ty() -> OneTy<u32> {
+    5u32
+    //~^ ERROR non-defining opaque type use in defining scope
+}
+
+fn concrete_lifetime() -> OneLifetime<'static> {
+    6u32
+    //~^ ERROR non-defining opaque type use in defining scope
+}
+
+fn concrete_const() -> OneConst<{ 123 }> {
+    7u32
+    //~^ ERROR non-defining opaque type use in defining scope
+}