rollup source maps support

lib/rollup.js

@@ -236,7 +236,10 @@ exports.rollupTree = function(loader, tree, entryPoints, traceOpts, compileOpts)
           return resolved;
         },
         load: function(id, options) {
-          return tree[id].metadata.originalSource || tree[id].source;
+          return {
+            code: tree[id].metadata.originalSource || tree[id].source,
+            map: tree[id].metadata.sourceMap
+          };
         }
       }],
       onwarn: function(message) {}
@@ -275,11 +278,12 @@ exports.rollupTree = function(loader, tree, entryPoints, traceOpts, compileOpts)
       var output = bundle.generate(generateOptions);
 
       // convert sources list into paths
-      // no input source maps support, so nothing more to worry about here
-      if (output.map)
+      if (output.map) {
         output.map.sources = output.map.sources.map(function(name) {
-          return tree[name].path;
+          name = loader.getCanonicalName(loader.decanonicalize(name));
+          return tree[name] && tree[name].path || loader.decanonicalize(name);
         });
+      }
 
       if (fullTreeRollup)
         return {

package.json

@@ -11,7 +11,7 @@
     "es6-template-strings": "^2.0.0",
     "glob": "^7.0.3",
     "mkdirp": "^0.5.1",
-    "rollup": "^0.30.0",
+    "rollup": "^0.31.2",
     "source-map": "^0.5.3",
     "systemjs": "^0.19.31",
     "traceur": "0.0.105",