Use revisions for cross-crate test

Author: fee1-dead

src/test/ui/rfc-2632-const-trait-impl/cross-crate-feature-disabled.rs

@@ -1,5 +1,5 @@
 error[E0015]: calls in constant functions are limited to constant functions, tuple structs and tuple variants
-  --> $DIR/cross-crate-feature-enabled.rs:15:5
+  --> $DIR/cross-crate.rs:16:5
    |
 LL |     NonConst.func();
    |     ^^^^^^^^^^^^^^^

src/test/ui/rfc-2632-const-trait-impl/cross-crate-feature-enabled.stderr renamed to src/test/ui/rfc-2632-const-trait-impl/cross-crate.gated.stderr

@@ -1,4 +1,5 @@
-#![feature(const_trait_impl)]
+// revisions: stock gated
+#![cfg_attr(gated, feature(const_trait_impl))]
 #![allow(incomplete_features)]
 
 // aux-build: cross-crate.rs
@@ -15,6 +16,7 @@ const fn const_context() {
     NonConst.func();
     //~^ ERROR: calls in constant functions are limited to constant functions, tuple structs and tuple variants
     Const.func();
+    //[stock]~^ ERROR: calls in constant functions are limited to constant functions, tuple structs and tuple variants
 }
 
 fn main() {}

src/test/ui/rfc-2632-const-trait-impl/cross-crate-feature-enabled.rs renamed to src/test/ui/rfc-2632-const-trait-impl/cross-crate.rs

@@ -1,11 +1,11 @@
 error[E0015]: calls in constant functions are limited to constant functions, tuple structs and tuple variants
-  --> $DIR/cross-crate-feature-disabled.rs:12:5
+  --> $DIR/cross-crate.rs:16:5
    |
 LL |     NonConst.func();
    |     ^^^^^^^^^^^^^^^
 
 error[E0015]: calls in constant functions are limited to constant functions, tuple structs and tuple variants
-  --> $DIR/cross-crate-feature-disabled.rs:14:5
+  --> $DIR/cross-crate.rs:18:5
    |
 LL |     Const.func();
    |     ^^^^^^^^^^^^