Use File#exist? to silence deprecation warnings.

Author: Sven Schwyn

Rakefile

@@ -53,7 +53,6 @@ RDoc::Task.new do |rdoc|
   rdoc.rdoc_files.include("bin/*.rb")
   rdoc.rdoc_files.include("lib/**/*.rb")
   extra_files.each { |file|
-    rdoc.rdoc_files.include(file) if File.exists?(file)
+    rdoc.rdoc_files.include(file) if File.exist?(file)
   }
 end
-

lib/net/sftp/operations/upload.rb

@@ -173,7 +173,7 @@ def initialize(sftp, local, remote, options={}, &progress) #:nodoc:
           process_next_entry
         end
       else
-        raise ArgumentError, "expected a file to upload" unless local.respond_to?(:read) || ::File.exists?(local)
+        raise ArgumentError, "expected a file to upload" unless local.respond_to?(:read) || ::File.exist?(local)
         @stack = [[local]]
         process_next_entry
       end