Add test for an explicit non-'static lifetime in a const argument

src/test/ui/const-generics/const-argument-non-static-lifetime.rs

@@ -0,0 +1,17 @@
+// run-pass
+
+#![feature(const_generics)]
+//~^ WARN the feature `const_generics` is incomplete
+#![allow(dead_code)]
+
+fn test<const N: usize>() {}
+
+fn wow<'a>() -> &'a () {
+    test::<{
+        let _: &'a ();
+        3
+    }>();
+    &()
+}
+
+fn main() {}

src/test/ui/const-generics/const-argument-non-static-lifetime.stderr

@@ -0,0 +1,11 @@
+warning: the feature `const_generics` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/const-argument-non-static-lifetime.rs:3:12
+   |
+LL | #![feature(const_generics)]
+   |            ^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+
+warning: 1 warning emitted
+