Change the way parseStack returns the stack to be fiber-aware

tools/buildmessage.js

@@ -433,7 +433,13 @@ var error = function (message, options) {
 
   if ('useMyCaller' in info) {
     if (info.useMyCaller) {
-      info.stack = parseStack.parse(new Error()).slice(2);
+      const {
+        insideFiber,
+        outsideFiber
+      } = parseStack.parse(new Error());
+
+      // Concatenate and get rid of lines about Future and buildmessage
+      info.stack = outsideFiber.concat(insideFiber).slice(2);
       if (typeof info.useMyCaller === 'number') {
         info.stack = info.stack.slice(info.useMyCaller);
       }

tools/selftest.js

@@ -1805,7 +1805,7 @@ var runTests = function (options) {
       testList.notifyFailed(test);
 
       if (failure instanceof TestFailure) {
-        var frames = parseStack.parse(failure);
+        var frames = parseStack.parse(failure).outsideFiber;
         var relpath = files.pathRelative(files.getCurrentToolsDir(),
                                          frames[0].file);
         Console.rawError("  => " + failure.reason + " at " +

tools/utils/parse-stack.js

@@ -38,9 +38,10 @@ export function parse(err) {
   const outsideFiber = parseStackFrames(frames);
   const insideFiber = parseStackFrames(frames.slice(indexOfFiberSplit + 1));
 
-  // Put the frames below the split at the top of the printed stack trace, since
-  // they are more likely to contain the code that actually threw the error.
-  return insideFiber.concat(outsideFiber);
+  return {
+    insideFiber,
+    outsideFiber
+  };
 }
 
 // Decorator. Mark the point at which a stack trace returned by