From bb59ec39e2d584e137027e1f3f225a6aee1cc43c Mon Sep 17 00:00:00 2001
From: Frankie Dintino <fdintino@gmail.com>
Date: Sun, 6 Jan 2019 22:58:13 -0500
Subject: [PATCH] Fix bug where exceptions were silently swallowed with
 synchronous render

fixes #678, #1116, #1127, and #1164. Closes #689
---
 CHANGELOG.md                | 9 +++++++++
 nunjucks/src/environment.js | 6 +++++-
 tests/compiler.js           | 8 ++++++++
 3 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2318db8c..9c065bf6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,15 @@
 Changelog
 =========
 
+3.1.6 (unreleased)
+------------------
+
+* Fix bug where exceptions were silently swallowed with synchronous render.
+  Fixes [#678](https://github.com/mozilla/nunjucks/issues/678),
+  [#1116](https://github.com/mozilla/nunjucks/issues/1116),
+  [#1127](https://github.com/mozilla/nunjucks/issues/1127), and
+  [#1164](https://github.com/mozilla/nunjucks/issues/1164)
+
 3.1.5 (Dec 13 2018)
 -------------------
 
diff --git a/nunjucks/src/environment.js b/nunjucks/src/environment.js
index e7fd163b..bb1c3b90 100644
--- a/nunjucks/src/environment.js
+++ b/nunjucks/src/environment.js
@@ -468,7 +468,11 @@ class Template extends Obj {
     this.rootRenderFunc(this.env, context, frame, globalRuntime, (err, res) => {
       if (didError) {
         // prevent multiple calls to cb
-        return;
+        if (cb) {
+          return;
+        } else {
+          throw err;
+        }
       }
       if (err) {
         err = lib._prettifyError(this.path, this.env.opts.dev, err);
diff --git a/tests/compiler.js b/tests/compiler.js
index d6b590d9..a282ecca 100644
--- a/tests/compiler.js
+++ b/tests/compiler.js
@@ -795,6 +795,14 @@
     });
 
     if (!isSlim) {
+      it('should throw exceptions when called synchronously', function() {
+        var tmpl = new Template('{% from "doesnotexist" import foo %}');
+        function templateRender() {
+          tmpl.render();
+        }
+        expect(templateRender).to.throwException(/template not found: doesnotexist/);
+      });
+
       it('should include error line in raised TemplateError', function(done) {
         var tmplStr = [
           '{% set items = ["a", "b",, "c"] %}',