diff --git a/compiler/src/dmd/globals.d b/compiler/src/dmd/globals.d
index 1919d9ae0ce1..a828b9c79e59 100644
--- a/compiler/src/dmd/globals.d
+++ b/compiler/src/dmd/globals.d
@@ -157,7 +157,7 @@ extern (C++) struct Param
                                  // https://digitalmars.com/d/archives/digitalmars/D/Binding_rvalues_to_ref_parameters_redux_325087.html
                                  // Implementation: https://github.com/dlang/dmd/pull/9817
     FeatureState noSharedAccess; // read/write access to shared memory objects
-    bool previewIn;              // `in` means `[ref] scope const`, accepts rvalues
+    bool previewIn = true;       // `in` means `[ref] scope const`, accepts rvalues
     bool inclusiveInContracts;   // 'in' contracts of overridden methods must be a superset of parent contract
     bool shortenedMethods = true;       // allow => in normal function declarations
     bool fixImmutableConv;       // error on unsound immutable conversion - https://github.com/dlang/dmd/pull/14070
diff --git a/compiler/test/run.d b/compiler/test/run.d
index 3d1ddf883fbd..7510c1e2bbb2 100755
--- a/compiler/test/run.d
+++ b/compiler/test/run.d
@@ -158,7 +158,7 @@ Options:
         args = ["all"];
 
     // move any long-running tests to the front
-    static size_t sortKey(in ref Target target)
+    static size_t sortKey(const scope ref Target target)
     {
         const name = target.normalizedTestName;
         if (name.startsWith("runnable"))