Better group RFC ui tests together

tests/ui/rfcs/rfc-2632-const-trait-impl/specialization/non-const-default-const-specialized.rs

@@ -0,0 +1,39 @@
+// Tests that a non-const default impl can be specialized by a const trait impl,
+// but that the default impl cannot be used in a const context.
+
+// run-pass
+
+#![feature(const_trait_impl)]
+#![feature(min_specialization)]
+
+#[const_trait]
+trait Value {
+    fn value() -> u32;
+}
+
+const fn get_value<T: ~const Value>() -> u32 {
+    T::value()
+}
+
+impl<T> Value for T {
+    default fn value() -> u32 {
+        println!("You can't do that (constly)");
+        0
+    }
+}
+
+struct FortyTwo;
+
+impl const Value for FortyTwo {
+    fn value() -> u32 {
+        42
+    }
+}
+
+fn main() {
+    let zero = get_value::<()>();
+    assert_eq!(zero, 0);
+
+    const FORTY_TWO: u32 = get_value::<FortyTwo>();
+    assert_eq!(FORTY_TWO, 42);
+}