Merge 3686889283 into f36a1eaa8b

lib/sourcemap.js

@@ -70,8 +70,10 @@ function SourceMap(options) {
             source = info.source;
             orig_line = info.line;
             orig_col = info.column;
+            if (info.name) {
                 name = info.name;
             }
+        }
         generator.addMapping({
             generated : { line: gen_line + options.dest_line_diff, column: gen_col },
             original  : { line: orig_line + options.orig_line_diff, column: orig_col },