Fix tests of rb_warning().
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37836 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Fix tests of rb_warning().
(Test::Unit::Assertions#assert_warn), test/ruby/envutil.rb,
test/ruby/test_enumerator.rb, test/ruby/test_io_m17n.rb,
test/ruby/test_regexp.rb, test/ruby/test_syntax.rb:
assert_warn() and assert_warning() are reversed.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37836 b2dd03c8-39d4-4d8f-98ff-823fe69b080e