load definitions from a marshalled file

activesupport/build_marshalled_tzinfo_data.rb

+#!/usr/bin/env ruby
+Dir.chdir(File.expand_path("..", __FILE__))
+$: << File.expand_path("../lib", __FILE__)
+require "active_support"
+
+ActiveSupport::TimeZone.all
+
+def flatten_constants(mod, ary = [])
+  ary << mod
+  mod.constants.each do |const|
+    flatten_constants(mod.const_get(const), ary)
+  end
+  ary
+end
+
+defns = flatten_constants(TZInfo::Definitions).select { |mod|
+  defined?(mod.get)
+}.map { |tz|
+  tz.get
+}
+
+file = "lib/active_support/vendor/tzinfo-0.3.12/tzinfo/definitions.dump"
+data = Marshal.dump(defns)
+Marshal.load(data)
+File.open(file, "wb") do |f|
+  require "pry"
+  pry binding
+  f.write(data)
+end
+puts "Wrote #{data.size} bytes to #{file}"

activesupport/lib/active_support/vendor/tzinfo-0.3.12/tzinfo.rb

 #--
 # Copyright (c) 2005-2006 Philip Ross
-# 
+#
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the "Software"), to deal
 # in the Software without restriction, including without limitation the rights
 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 # copies of the Software, and to permit persons to whom the Software is
 # furnished to do so, subject to the following conditions:
-# 
+#
 # The above copyright notice and this permission notice shall be included in all
 # copies or substantial portions of the Software.
 #
@@ -30,4 +30,5 @@
 # require 'tzinfo/tzdataparser'
 # require 'tzinfo/timezone_proxy'
 require 'tzinfo/data_timezone'
-require 'tzinfo/linked_timezone'
\ No newline at end of file
+require 'tzinfo/linked_timezone'
+require 'tzinfo/definitions'

activesupport/lib/active_support/vendor/tzinfo-0.3.12/tzinfo/definitions.rb

+require "tzinfo/data_timezone_info"
+require "tzinfo/linked_timezone_info"
+require "tzinfo/timezone_definition"
+
+module TZInfo
+  module Definitions
+    def self.load_all!
+      return true if @loaded
+      @loaded = true
+
+      defns = Marshal.load(File.read(File.expand_path("../definitions.dump", __FILE__)))
+
+      defns.each do |defn|
+        tz_mod = defn.instance_variable_get(:@identifier).split("/").reduce(TZInfo::Definitions) { |mod, name|
+          if mod.const_defined?(name)
+            mod.const_get(name)
+          else
+            mod.const_set(name, Module.new)
+          end
+        }
+
+        def tz_mod.get
+          @timezone
+        end
+
+        tz_mod.instance_variable_set(:@timezone, defn)
+      end
+    end
+  end
+end