Remove #[default..] and add #[const_trait]

src/test/ui/rfc-2632-const-trait-impl/impl-with-default-fn-pass.rs

@@ -2,28 +2,21 @@
 
 #![feature(const_trait_impl)]
 
+#[const_trait]
 trait Tr {
     fn req(&self);
 
-    fn prov(&self) {
-        println!("lul");
-        self.req();
-    }
-
-    #[default_method_body_is_const]
     fn default() {}
 }
 
 impl const Tr for u8 {
     fn req(&self) {}
-    fn prov(&self) {}
 }
 
 macro_rules! impl_tr {
     ($ty: ty) => {
         impl const Tr for $ty {
             fn req(&self) {}
-            fn prov(&self) {}
         }
     }
 }