Remove built-in Pathname

Author: nobu

lib/pathname.rb

@@ -10,6 +10,24 @@
 # For documentation, see class Pathname.
 #
 
+if defined?(::Pathname) # Clear builtin Pathname
+  # :stopdoc:
+  class ::Object
+    remove_const :Pathname
+  end
+
+  # Remove module_function Pathname
+  class << ::Kernel
+    undef Pathname
+  end
+  module ::Kernel
+    undef Pathname
+  end
+
+  $".delete('pathname.so')
+  # :startdoc:
+end
+
 require 'pathname.so'
 
 class Pathname