diff --git a/src/dmd/globals.d b/src/dmd/globals.d
index 8b0bc33841b4..686cc8a7f595 100644
--- a/src/dmd/globals.d
+++ b/src/dmd/globals.d
@@ -142,7 +142,7 @@ extern (C++) struct Param
     bool useTypeInfo = true;     // generate runtime type information
     bool useExceptions = true;   // support exception handling
     bool 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 shortenedMethods; // allow => in normal function declarations
     bool betterC;           // be a "better C" compiler; no dependency on D runtime
     bool addMain;           // add a default main() function
diff --git a/test/run.d b/test/run.d
index 388e9b0109d7..048e6a6ce906 100755
--- a/test/run.d
+++ b/test/run.d
@@ -164,7 +164,7 @@ 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"))