diff --git a/js-assembler/package.rkt b/js-assembler/package.rkt
index c515bb5..530893b 100644
--- a/js-assembler/package.rkt
+++ b/js-assembler/package.rkt
@@ -631,11 +631,13 @@ var invokeMainModule = function() {
                                     .css('whitespace', 'pre')
                                     .appendTo(subcontextDiv);
                         } else if (plt.runtime.isProcedure(context[i])) {
-                            $('<div/>').text('in ' + context[i].displayName)
-                                    .addClass('stacktrace')
-                                    .css('margin-left', '10px')
-                                    .css('whitespace', 'pre')
-                                    .appendTo(subcontextDiv);
+                            if (context[i].displayName) {
+                                $('<div/>').text('in ' + context[i].displayName)
+                                        .addClass('stacktrace')
+                                        .css('margin-left', '10px')
+                                        .css('whitespace', 'pre')
+                                        .appendTo(subcontextDiv);
+                            }
                         }                                     
                     }
                 }
diff --git a/js-assembler/runtime-src/baselib-functions.js b/js-assembler/runtime-src/baselib-functions.js
index 3d24b89..4f4fce0 100644
--- a/js-assembler/runtime-src/baselib-functions.js
+++ b/js-assembler/runtime-src/baselib-functions.js
@@ -81,18 +81,10 @@
 
 
     var isProcedure = function (x) {
-        return (typeof (x) === 'function' ||
-                x instanceof Closure);
+        return (typeof (x) === 'function' || x instanceof Closure);
     };
 
 
-
-
-
-
-
-
-  
     var coersePrimitiveToJavaScript = function (v, MACHINE) {
         return function (succ, fail) {
             try {
diff --git a/js-assembler/runtime-src/baselib-primitives.js b/js-assembler/runtime-src/baselib-primitives.js
index a033096..25f1a13 100644
--- a/js-assembler/runtime-src/baselib-primitives.js
+++ b/js-assembler/runtime-src/baselib-primitives.js
@@ -603,7 +603,7 @@
         'list*',
         baselib.arity.makeArityAtLeast(1),
         function (M) {
-            var result = checkList(M, 'list*', M.a - 1), i;
+            var result = checkAny(M, 'list*', M.a - 1), i;
             for (i = M.a - 2; i >= 0; i--) {
                 result = makePair(M.e[M.e.length - 1 - i],
                                   result);