diff --git a/lib/coffee-script/helpers.js b/lib/coffee-script/helpers.js
index f13f7ded..121af5ca 100644
--- a/lib/coffee-script/helpers.js
+++ b/lib/coffee-script/helpers.js
@@ -165,7 +165,7 @@
     }
     parts = file.split('.');
     parts.pop();
-    if (parts[parts.length - 1] === 'coffee') {
+    if (parts[parts.length - 1] === 'coffee' && parts.length > 1) {
       parts.pop();
     }
     return parts.join('.');
diff --git a/lib/coffee-script/nodes.js b/lib/coffee-script/nodes.js
index 22f0e355..823da469 100644
--- a/lib/coffee-script/nodes.js
+++ b/lib/coffee-script/nodes.js
@@ -1394,18 +1394,12 @@
     };
 
     Class.prototype.addBoundFunctions = function(o) {
-      var body, bound, func, lhs, name, rhs, _i, _len, _ref4, _ref5;
-      if (this.boundFuncs.length) {
-        o.scope.assign('_this', 'this');
-        _ref4 = this.boundFuncs;
-        for (_i = 0, _len = _ref4.length; _i < _len; _i++) {
-          _ref5 = _ref4[_i], name = _ref5[0], func = _ref5[1];
-          lhs = new Value(new Literal("this"), [new Access(name)]);
-          body = new Block([new Return(new Literal("" + this.ctor.name + ".prototype." + name.value + ".apply(_this, arguments)"))]);
-          rhs = new Code(func.params, body, 'boundfunc');
-          bound = new Assign(lhs, rhs);
-          this.ctor.body.push(bound);
-        }
+      var bvar, lhs, _i, _len, _ref4;
+      _ref4 = this.boundFuncs;
+      for (_i = 0, _len = _ref4.length; _i < _len; _i++) {
+        bvar = _ref4[_i];
+        lhs = (new Value(new Literal("this"), [new Access(bvar)])).compile(o);
+        this.ctor.body.unshift(new Literal("" + lhs + " = " + (utility('bind')) + "(" + lhs + ", this)"));
       }
     };
 
@@ -1442,7 +1436,7 @@
               } else {
                 assign.variable = new Value(new Literal(name), [new Access(new Literal('prototype')), new Access(base)]);
                 if (func instanceof Code && func.bound) {
-                  this.boundFuncs.push([base, func]);
+                  this.boundFuncs.push(base);
                   func.bound = false;
                 }
               }
@@ -3048,6 +3042,9 @@
     "extends": function() {
       return "function(child, parent) { for (var key in parent) { if (" + (utility('hasProp')) + ".call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; }";
     },
+    bind: function() {
+      return 'function(fn, me){ return function(){ return fn.apply(me, arguments); }; }';
+    },
     indexOf: function() {
       return "[].indexOf || function(item) { for (var i = 0, l = this.length; i < l; i++) { if (i in this && this[i] === item) return i; } return -1; }";
     },
diff --git a/src/helpers.coffee b/src/helpers.coffee
index 183b123a..9f4919e1 100644
--- a/src/helpers.coffee
+++ b/src/helpers.coffee
@@ -120,7 +120,7 @@ exports.baseFileName = (file, stripExt = no) ->
   return file unless stripExt
   parts = file.split('.')
   parts.pop()
-  parts.pop() if parts[parts.length - 1] is 'coffee'
+  parts.pop() if parts[parts.length - 1] is 'coffee' and parts.length > 1
   parts.join('.')
 
 # Determine if a filename represents a CoffeeScript file.
diff --git a/src/nodes.coffee b/src/nodes.coffee
index 967b98c3..db536d0d 100644
--- a/src/nodes.coffee
+++ b/src/nodes.coffee
@@ -983,14 +983,9 @@ exports.Class = class Class extends Base
   # Ensure that all functions bound to the instance are proxied in the
   # constructor.
   addBoundFunctions: (o) ->
-    if @boundFuncs.length
-      o.scope.assign '_this', 'this'
-      for [name, func] in @boundFuncs
-        lhs = new Value (new Literal "this"), [new Access name]
-        body = new Block [new Return new Literal "#{@ctor.name}.prototype.#{name.value}.apply(_this, arguments)"]
-        rhs = new Code func.params, body, 'boundfunc'
-        bound = new Assign lhs, rhs
-        @ctor.body.push bound
+    for bvar in @boundFuncs
+      lhs = (new Value (new Literal "this"), [new Access bvar]).compile o
+      @ctor.body.unshift new Literal "#{lhs} = #{utility 'bind'}(#{lhs}, this)"
     return
 
   # Merge the properties from a top-level object as prototypal properties
@@ -1020,7 +1015,7 @@ exports.Class = class Class extends Base
           else
             assign.variable = new Value(new Literal(name), [(new Access new Literal 'prototype'), new Access base ])
             if func instanceof Code and func.bound
-              @boundFuncs.push [base, func]
+              @boundFuncs.push base
               func.bound = no
       assign
     compact exprs
@@ -2122,6 +2117,11 @@ UTILITIES =
     function(child, parent) { for (var key in parent) { if (#{utility 'hasProp'}.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; }
   """
 
+  # Create a function bound to the current value of "this".
+  bind: -> '''
+    function(fn, me){ return function(){ return fn.apply(me, arguments); }; }
+  '''
+
   # Discover if an item is in an array.
   indexOf: -> """
     [].indexOf || function(item) { for (var i = 0, l = this.length; i < l; i++) { if (i in this && this[i] === item) return i; } return -1; }
diff --git a/test/classes.coffee b/test/classes.coffee
index e2604345..ffe95fe2 100644
--- a/test/classes.coffee
+++ b/test/classes.coffee
@@ -730,23 +730,52 @@ test "#2359: extending native objects that use other typed constructors requires
   eq 'yes!', workingArray.method()
 
 
-test "#2489: removing __bind", ->
+test "#2782: non-alphanumeric-named bound functions", ->
+  class A
+    'b:c': =>
+      'd'
 
-  class Thing
-    foo: (a, b, c) ->
-    bar: (a, b, c) =>
-
-  thing = new Thing
-
-  eq thing.foo.length, 3
-  eq thing.bar.length, 3
+  eq (new A)['b:c'](), 'd'
 
 
-test "#2773: overriding bound functions", ->
+test "#2781: overriding bound functions", ->
+  class A
+    a: ->
+        @b()
+    b: =>
+        1
+
+  class B extends A
+    b: =>
+        2
+
+  b = (new A).b
+  eq b(), 1
+
+  b = (new B).b
+  eq b(), 2
+
+
+test "#2791: bound function with destructured argument", ->
   class Foo
-    method: => 'Foo'
+    method: ({a}) => 'Bar'
 
-  class Bar extends Foo
-    method: => 'Bar'
+  eq (new Foo).method({a: 'Bar'}), 'Bar'
 
-  eq (new Bar).method(), 'Bar'
+
+test "#2796: ditto, ditto, ditto", ->
+  answer = null
+
+  outsideMethod = (func) ->
+    func.call message: 'wrong!'
+
+  class Base
+    constructor: ->
+      @message = 'right!'
+      outsideMethod @echo
+
+    echo: =>
+      answer = @message
+
+  new Base
+  eq answer, 'right!'
diff --git a/test/helpers.coffee b/test/helpers.coffee
index 66819084..7c5fa53b 100644
--- a/test/helpers.coffee
+++ b/test/helpers.coffee
@@ -2,7 +2,7 @@
 # -------
 
 # pull the helpers from `CoffeeScript.helpers` into local variables
-{starts, ends, compact, count, merge, extend, flatten, del, last} = CoffeeScript.helpers
+{starts, ends, compact, count, merge, extend, flatten, del, last, baseFileName} = CoffeeScript.helpers
 
 
 # `starts`
@@ -94,3 +94,33 @@ test "the `last` helper returns the last item of an array-like object", ->
 test "the `last` helper allows one to specify an optional offset", ->
   ary = [0, 1, 2, 3, 4]
   eq 2, last(ary, 2)
+
+# `baseFileName`
+
+test "the `baseFileName` helper returns the file name to write to", ->
+  ext = '.js'
+  sourceToCompiled =
+    '.coffee': ext
+    'a.coffee': 'a' + ext
+    'b.coffee': 'b' + ext
+    'coffee.coffee': 'coffee' + ext
+
+    '.litcoffee': ext
+    'a.litcoffee': 'a' + ext
+    'b.litcoffee': 'b' + ext
+    'coffee.litcoffee': 'coffee' + ext
+
+    '.lit': ext
+    'a.lit': 'a' + ext
+    'b.lit': 'b' + ext
+    'coffee.lit': 'coffee' + ext
+
+    '.coffee.md': ext
+    'a.coffee.md': 'a' + ext
+    'b.coffee.md': 'b' + ext
+    'coffee.coffee.md': 'coffee' + ext
+
+  for sourceFileName, expectedFileName of sourceToCompiled
+    name = baseFileName sourceFileName, yes
+    filename = name + ext
+    eq filename, expectedFileName