correct line number reporting for embedded engines

* errors in interpolation in InterpolatedTiltEngines not yet working (e.g. markdown)
* precompiled engines not yet working (e.g. liquid)

lib/slim/embedded_engine.rb

@@ -40,11 +40,17 @@ def collect_text(body)
       end
     end
 
+    def collect_newlines(body)
+      body[1..-1].inject([:multi]) do |multi, exp|
+        exp[0] == :newline ? (multi << exp) : multi
+      end
+    end
+
     # Basic tilt engine
     class TiltEngine < EmbeddedEngine
       def on_slim_embedded(engine, body)
         engine = Tilt[engine] || raise("Tilt engine #{engine} is not available.")
-        render(engine, collect_text(body))
+        [:multi, render(engine, collect_text(body)), collect_newlines(body)]
       end
     end
 
@@ -118,7 +124,7 @@ def on_slim_embedded(engine, body)
     # Embeds ruby code
     class RubyEngine < EmbeddedEngine
       def on_slim_embedded(engine, body)
-        [:code, collect_text(body)]
+        [:code, "\n" + collect_text(body)]
       end
     end
 

test/slim/test_ruby_errors.rb

@@ -82,7 +82,32 @@ def test_embedded_ruby
 = unknown_ruby_method
 }
 
-    assert_ruby_error NameError,"(__TEMPLATE__):5", source
+    assert_ruby_error NameError,"(__TEMPLATE__):6", source
+  end
+
+  def test_embedded_markdown
+    source = %q{
+markdown:
+  #Header
+  Hello from #{"Markdown!"}
+  "Second Line!"
+= unknown_ruby_method
+}
+
+    assert_ruby_error NameError,"(__TEMPLATE__):6", source
+  end
+
+  def test_embedded_liquid
+    source = %q{
+- text = 'before liquid block'
+liquid:
+  First
+  {{text}}
+  Third
+= unknown_ruby_method
+}
+
+    assert_ruby_error NameError,"(__TEMPLATE__):7", source
   end
 
   def test_embedded_javascript