clean up some warnings on trunk ruby

activesupport/lib/active_support/file_update_checker.rb

@@ -92,7 +92,7 @@ module ActiveSupport
 
     def watched
       @watched || begin
-        all = @files.select { |f| File.exists?(f) }
+        all = @files.select { |f| File.exist?(f) }
         all.concat(Dir[@glob]) if @glob
         all
       end

railties/lib/rails/application.rb

@@ -223,7 +223,7 @@ module Rails
     # you need to load files in lib/ during the application configuration as well.
     def add_lib_to_load_path! #:nodoc:
       path = File.join config.root, 'lib'
-      if File.exists?(path) && !$LOAD_PATH.include?(path)
+      if File.exist?(path) && !$LOAD_PATH.include?(path)
         $LOAD_PATH.unshift(path)
       end
     end

railties/lib/rails/application/configuration.rb

@@ -90,7 +90,7 @@ module Rails
       # Loads and returns the configuration of the database.
       def database_configuration
         yaml = paths["config/database"].first
-        if File.exists?(yaml)
+        if File.exist?(yaml)
           require "erb"
           YAML.load ERB.new(IO.read(yaml)).result
         elsif ENV['DATABASE_URL']

railties/lib/rails/paths.rb

@@ -198,7 +198,7 @@ module Rails
 
       # Returns all expanded paths but only if they exist in the filesystem.
       def existent
-        expanded.select { |f| File.exists?(f) }
+        expanded.select { |f| File.exist?(f) }
       end
 
       def existent_directories