Fix regression with executable class bodies and prototypal attachment.

lib/coffee-script/nodes.js

@@ -189,10 +189,11 @@
 
     Base.prototype.traverseChildren = function(crossScope, func) {
       return this.eachChild(function(child) {
-        if (func(child) === false) {
-          return false;
+        var recur;
+        recur = func(child);
+        if (recur !== false) {
+          return child.traverseChildren(crossScope, func);
         }
-        return child.traverseChildren(crossScope, func);
       });
     };
 

src/nodes.coffee

@@ -146,8 +146,8 @@ exports.Base = class Base
 
   traverseChildren: (crossScope, func) ->
     @eachChild (child) ->
-      return false if func(child) is false
-      child.traverseChildren crossScope, func
+      recur = func(child)
+      child.traverseChildren(crossScope, func) unless recur is no
 
   invert: ->
     new Op '!', this

test/classes.coffee

@@ -337,6 +337,18 @@ test "#2502: parenthesizing inner object values", ->
   eq (new A).sections.default, 0
 
 
+test "conditional prototype property assignment", ->
+  debug = false
+
+  class Person
+    if debug
+      age: -> 10
+    else
+      age: -> 20
+
+  eq (new Person).age(), 20
+
+
 test "mild metaprogramming", ->
 
   class Base