Squash warnings for unused variables and the like

lib/rack/file.rb

@@ -40,7 +40,7 @@ def _call(env)
       @path_info = Utils.unescape(env["PATH_INFO"])
       parts = @path_info.split SEPS
 
-      total_depth = parts.inject(0) do |depth, part|
+      parts.inject(0) do |depth, part|
         case part
         when '', '.'
           depth

test/spec_builder.rb

@@ -181,6 +181,7 @@ def config_file(name)
 
     it "removes __END__ before evaluating app" do
       app, options = Rack::Builder.parse_file config_file('end.ru')
+      options = nil # ignored, prevents warning
       Rack::MockRequest.new(app).get("/").body.to_s.should.equal 'OK'
     end
 

test/spec_content_length.rb

@@ -52,7 +52,7 @@ def to_ary; end
     end.new(%w[one two three])
 
     app = lambda { |env| [200, {}, body] }
-    response = Rack::ContentLength.new(app).call({})
+    Rack::ContentLength.new(app).call({})
     body.closed.should.equal true
   end
 

test/spec_file.rb

@@ -148,8 +148,6 @@
     env = Rack::MockRequest.env_for("/cgi/test")
     status, heads, _ = Rack::File.new(DOCROOT, 'public, max-age=38').call(env)
 
-    path = File.join(DOCROOT, "/cgi/test")
-
     status.should.equal 200
     heads['Cache-Control'].should.equal 'public, max-age=38'
   end