diff --git a/js-assembler/runtime-src/baselib-frames.js b/js-assembler/runtime-src/baselib-frames.js
index f2f0848..53479f2 100644
--- a/js-assembler/runtime-src/baselib-frames.js
+++ b/js-assembler/runtime-src/baselib-frames.js
@@ -38,7 +38,7 @@
 
 	// When we're in the middle of computing with-cont-mark, we
 	// stash the key in here temporarily.
-	this.pendingContinuationMarkKey = undefined;
+	// this.pendingContinuationMarkKey = undefined;
     };
     CallFrame.prototype = baselib.heir(Frame.prototype);
 
@@ -55,7 +55,7 @@
 
 	// When we're in the middle of computing with-cont-mark, we
 	// stash the key in here temporarily.
-	this.pendingContinuationMarkKey = undefined;	
+	// this.pendingContinuationMarkKey = undefined;	
     };
     PromptFrame.prototype = baselib.heir(Frame.prototype);
 
diff --git a/js-assembler/runtime-src/baselib-primitives.js b/js-assembler/runtime-src/baselib-primitives.js
index db35943..ba6ca9c 100644
--- a/js-assembler/runtime-src/baselib-primitives.js
+++ b/js-assembler/runtime-src/baselib-primitives.js
@@ -2249,11 +2249,7 @@
                             constructorName,
                             initFieldCount + (superType ? superType.numberOfArgs : 0),
                             function (M) {
-                                var args = [];
-				var i;
-                                for(i = 0; i < M.a; i++) {
-                                    args.push(M.e[M.e.length - 1 - i]);
-                                }
+                                var args = M.e.slice(M.e.length - M.a).reverse();
                                 return structType.constructor.apply(null, args);
                             });