From f206ad26942edc51a235ef6d8517133bf1daeac3 Mon Sep 17 00:00:00 2001
From: Titus Wormer <tituswormer@gmail.com>
Date: Sun, 12 Jun 2016 14:50:48 +0200
Subject: [PATCH] Fix swallowed sync parse / compile error

---
 lib/unified.js | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/lib/unified.js b/lib/unified.js
index 01f1b8bf..2e8a22f7 100644
--- a/lib/unified.js
+++ b/lib/unified.js
@@ -446,6 +446,7 @@ function unified() {
      */
     function process(file, options, done) {
         var complete = false;
+        var exception;
 
         assertConcrete('process');
         assertParser('process');
@@ -464,11 +465,18 @@ function unified() {
         }, function (err) {
             complete = true;
 
-            (done || bail)(err, file);
+            if (done) {
+                done(err, file);
+            } else {
+                exception = err;
+            }
         });
 
         assertDone('process', complete, done);
 
+        /* Throw sync error. */
+        bail(exception);
+
         return file;
     }