1e25c9da306f38ddf7bd3c63ed7c9540b75384e0#commitcomment-719177

lib/coffee-script/scope.js

@@ -23,7 +23,7 @@
 
     Scope.prototype.add = function(name, type, immediate) {
       if (this.shared && !immediate) return this.parent.add(name, type, immediate);
-      if (this.positions.hasOwnProperty(name)) {
+      if (Object.prototype.hasOwnProperty.call(this.positions, name)) {
         return this.variables[this.positions[name]].type = type;
       } else {
         return this.positions[name] = this.variables.push({

src/scope.coffee

@@ -25,7 +25,7 @@ exports.Scope = class Scope
   # Adds a new variable or overrides an existing one.
   add: (name, type, immediate) ->
     return @parent.add name, type, immediate if @shared and not immediate
-    if @positions.hasOwnProperty name
+    if Object::hasOwnProperty.call @positions, name
       @variables[@positions[name]].type = type
     else
       @positions[name] = @variables.push({name, type}) - 1

test/compilation.coffee

@@ -59,3 +59,6 @@ test "#1106: __proto__ compilation", ->
   object = eq
   @["__proto__"] = true
   ok __proto__
+
+test "reference named hasOwnProperty", ->
+  CoffeeScript.compile 'hasOwnProperty = 0; a = 1'