diff --git a/src/dmd/globals.d b/src/dmd/globals.d
index af8703cabc83..f8a2f600cc41 100644
--- a/src/dmd/globals.d
+++ b/src/dmd/globals.d
@@ -175,7 +175,7 @@ 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 betterC;           // be a "better C" compiler; no dependency on D runtime
     bool addMain;           // add a default main() function
     bool allInst;           // generate code for all template instantiations
diff --git a/test/run.d b/test/run.d
index af8fadbece04..5117eacc95d5 100755
--- a/test/run.d
+++ b/test/run.d
@@ -148,7 +148,7 @@ 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"))