Fix: `__extends` helper above directive prologue

lib/coffee-script/nodes.js

@@ -1537,7 +1537,6 @@
         this.body.expressions.unshift(this.ctor);
       }
       this.body.expressions.push(lname);
-      (_ref4 = this.body.expressions).unshift.apply(_ref4, this.directives);
       call = Closure.wrap(this.body);
       if (this.parent && call.args) {
         this.superClass = new Literal(o.scope.freeVariable('super', false));
@@ -1546,6 +1545,7 @@
         params = call.variable.params || call.variable.base.params;
         params.push(new Param(this.superClass));
       }
+      (_ref4 = this.body.expressions).unshift.apply(_ref4, this.directives);
       klass = new Parens(call, true);
       if (this.variable) {
         klass = new Assign(this.variable, klass);

src/nodes.coffee

@@ -1098,7 +1098,6 @@ exports.Class = class Class extends Base
     @body.spaced = yes
     @body.expressions.unshift @ctor unless @ctor instanceof Code
     @body.expressions.push lname
-    @body.expressions.unshift @directives...
 
     call  = Closure.wrap @body
 
@@ -1109,6 +1108,8 @@ exports.Class = class Class extends Base
       params = call.variable.params or call.variable.base.params
       params.push new Param @superClass
 
+    @body.expressions.unshift @directives...
+
     klass = new Parens call, yes
     klass = new Assign @variable, klass if @variable
     klass.compileToFragments o

test/classes.coffee

@@ -699,6 +699,15 @@ test "#2052: classes should work in strict mode", ->
   catch e
     ok no
 
+test "directives in class with extends ", ->
+  strictTest = """
+    class extends Object
+      ### comment ###
+      'use strict'
+      do -> eq this, undefined
+  """
+  CoffeeScript.run strictTest, bare: yes
+
 test "#2630: class bodies can't reference arguments", ->
   throws ->
     CoffeeScript.compile('class Test then arguments')