fixed feature gate to right place

src/libsyntax/feature_gate.rs

@@ -473,8 +473,6 @@ pub fn walk_feature_fields<F>(&self, mut f: F)
     // 'a: { break 'a; }
     (active, label_break_value, "1.28.0", Some(48594), None),
 
-    // Termination trait in tests (RFC 1937)
-    (accepted, termination_trait_test, "1.28.0", Some(48854), Some(Edition::Edition2018)),
 );
 
 declare_features! (
@@ -609,6 +607,8 @@ pub fn walk_feature_fields<F>(&self, mut f: F)
     (accepted, fn_must_use, "1.27.0", Some(43302), None),
     // Allows use of the :lifetime macro fragment specifier
     (accepted, macro_lifetime_matcher, "1.27.0", Some(34303), None),
+    // Termination trait in tests (RFC 1937)
+    (accepted, termination_trait_test, "1.27.0", Some(48854), Some(Edition::Edition2018)),
 );
 
 // If you change this, please modify src/doc/unstable-book as well. You must