Test showing wrap_layout is still broken when used with haml

middleman-core/fixtures/nested-layout-app/source/haml-test.html.markdown

@@ -0,0 +1,7 @@
+--- 
+title: "New Article Title"
+date: 2011-01-01
+layout: inner_haml
+---
+
+The Article Content

middleman-core/fixtures/nested-layout-app/source/layouts/inner_haml.haml

@@ -0,0 +1,3 @@
+- wrap_layout :outer_haml do
+  Inner
+  = yield

middleman-core/fixtures/nested-layout-app/source/layouts/master_haml.haml

@@ -0,0 +1,3 @@
+Master
+= data.page.title
+= yield

middleman-core/fixtures/nested-layout-app/source/layouts/outer_haml.haml

@@ -0,0 +1,3 @@
+- wrap_layout :master_haml do
+  Outer
+  = yield

middleman-core/lib/middleman-core/core_extensions/rendering.rb

@@ -336,6 +336,11 @@ module Middleman
             @_out_buf = _buf_was
           end
           layout_path = locate_layout(layout_name, current_engine)
+
+          if !@_out_buf
+            raise "wrap_layout is currently broken for this templating system"
+          end
+
           @_out_buf.concat render_individual_file(layout_path, @current_locs || {}, @current_opts || {}, self) { content }
         end
     

middleman-more/features/nested_layouts.feature

@@ -13,6 +13,12 @@ Feature: Allow nesting of layouts
     And I should see "Inner"
     And I should see "Outer"
     And I should see "Master"
+    When I go to "/haml-test.html"
+    And I should see "New Article Title"
+    And I should see "The Article Content"
+    And I should see "Inner"
+    And I should see "Outer"
+    And I should see "Master"
     
 
   Scenario: YAML Front Matter isn't clobbered with nested layouts