From ff06a8283458db5624447f99d2c359e1711b8c99 Mon Sep 17 00:00:00 2001
From: Augusto Franzoia <ajfranzoia@gmail.com>
Date: Tue, 8 Mar 2016 01:21:24 -0300
Subject: [PATCH] Support dynamic arguments in async.constant (ref. #1016)

---
 lib/constant.js        |  5 +++--
 mocha_test/constant.js | 28 ++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+), 2 deletions(-)
 create mode 100644 mocha_test/constant.js

diff --git a/lib/constant.js b/lib/constant.js
index 706507f30..ecaff802f 100644
--- a/lib/constant.js
+++ b/lib/constant.js
@@ -4,7 +4,8 @@ import rest from 'lodash/rest';
 
 export default rest(function(values) {
     var args = [null].concat(values);
-    return function (cb) {
-        return cb.apply(this, args);
+    return function () {
+        var callback = [].slice.call(arguments).pop();
+        return callback.apply(this, args);
     };
 });
diff --git a/mocha_test/constant.js b/mocha_test/constant.js
new file mode 100644
index 000000000..d76076c15
--- /dev/null
+++ b/mocha_test/constant.js
@@ -0,0 +1,28 @@
+var async = require('../lib');
+var expect = require('chai').expect;
+
+describe('constant', function () {
+
+    it('basic usage', function(done){
+        var f = async.constant(42, 1, 2, 3);
+        f(function (err, value, a, b, c) {
+            expect(err).to.equal(null);
+            expect(value).to.equal(42);
+            expect(a).to.equal(1);
+            expect(b).to.equal(2);
+            expect(c).to.equal(3);
+            done();
+        });
+    });
+
+    it('called with multiple arguments', function(done){
+        var f = async.constant(42, 1, 2, 3);
+        f('argument to ignore', 'another argument', function (err, value, a) {
+            expect(err).to.equal(null);
+            expect(value).to.equal(42);
+            expect(a).to.equal(1);
+            done();
+        });
+    });
+
+});