* lib/uri/rfc3986_parser.rb: raise URI::InvalidURIError when
  uri doesn't respond to #to_str. [ruby-core:64453] [Bug #10150]

* test/uri/test_parser.rb: test for above.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47721 b2dd03c8-39d4-4d8f-98ff-823fe69b080e