Added patch to call the callback passed into compileFile in the event of an error thrown in compile

lib/swig.js

@@ -636,7 +636,16 @@ exports.Swig = function (opts) {
           cb(err);
           return;
         }
-        cb(err, self.compile(src, options));
+        var compiled;
+
+        try {
+          compiled = self.compile(src, options);
+        } catch (err2) {
+          cb(err2);
+          return;
+        }
+
+        cb(err, compiled);
       });
       return;
     }

tests/basic.test.js

@@ -187,6 +187,14 @@ describe('swig.compileFile', function () {
       }));
     });
   });
+
+  it('can use callback with errors', function (done) {
+    var errorTest = __dirname + '/cases-error/extends-non-existent.test.html';
+    expect(swig.compileFile(errorTest, {}, function (err) {
+      expect(err.errno).to.equal(34);
+      done();
+    }));
+  });
 });
 
 describe('swig.renderFile', function () {

tests/cases-error/extends-non-existent.test.html

@@ -0,0 +1 @@
+{% extends 'does-not-exist.html' %}