Merge pull request rails#3735 from kennyj/fix_3728

Fix rails#3728 Remove unreachable code, and add additional testcases.

actionpack/lib/action_dispatch/middleware/params_parser.rb

@@ -54,12 +54,7 @@ def parse_formatted_parameters(env)
       rescue Exception => e # YAML, XML or Ruby code block errors
         logger.debug "Error occurred while parsing request parameters.\nContents:\n\n#{request.raw_post}"
 
-        raise
-          { "body"           => request.raw_post,
-            "content_type"   => request.content_mime_type,
-            "content_length" => request.content_length,
-            "exception"      => "#{e.message} (#{e.class})",
-            "backtrace"      => e.backtrace }
+        raise e
       end
 
       def content_type_from_legacy_post_data_format_header(env)

actionpack/test/dispatch/request/json_params_parsing_test.rb

@@ -45,6 +45,18 @@ def teardown
     end
   end
 
+  test "occurring a parse error if parsing unsuccessful" do
+    with_test_routing do
+      begin
+        $stderr = StringIO.new # suppress the log
+        json = "[\"person]\": {\"name\": \"David\"}}"
+        assert_raise(MultiJson::DecodeError) { post "/parse", json, {'CONTENT_TYPE' => 'application/json', 'action_dispatch.show_exceptions' => false} }
+      ensure
+        $stderr = STDERR
+      end
+    end
+  end
+
   private
     def assert_parses(expected, actual, headers = {})
       with_test_routing do

actionpack/test/dispatch/request/xml_params_parsing_test.rb

@@ -67,6 +67,18 @@ def call(env)
     end
   end
 
+  test "occurring a parse error if parsing unsuccessful" do
+    with_test_routing do
+      begin
+        $stderr = StringIO.new # suppress the log
+        xml = "<person><name>David</name></pineapple>"
+        assert_raise(REXML::ParseException) { post "/parse", xml, default_headers.merge('action_dispatch.show_exceptions' => false) }
+      ensure
+        $stderr = STDERR
+      end
+    end
+  end
+
   test "parses multiple files" do
     xml = <<-end_body
       <person>