parse and tokenize modules

internal/bootstrap.cm

@@ -24,10 +24,9 @@ function use(path) {
 
   if (fd.is_file(file_path)) {
     script = text(fd.slurp(file_path))
-    exports = {}
-    mach_eval(path, script, {use: use, exports: exports})
-    use_cache[path] = exports
-    return exports
+    result = mach_eval(path, script, {use: use})
+    use_cache[path] = result
+    return result
   }
 
   // Try embedded C module