The directory is a Pathname object now; set the correct file path

rubberin

@@ -193,7 +193,8 @@ dirs.each do |dir|
   # Set up a watch per directory
   notifier.watch(dir, :close_write) do |ev|
     # Only compile if a dependency of the input file has been modified
-    next unless files.include?(dir + "/" + ev.name)
+    file_path = (dir + ev.name).to_s
+    next unless files.include? file_path
     puts "I: file #{ev.name} modified, compiling #{infile}..."
     compile(infile, mode)
     reload(infile, mode)