add test for r48563

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48581 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
use clock_gettime to avoid object creation

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48582 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
parse.y: fix invalid keyword argument

* parse.y (f_label, f_kw, formal_argument_gen): ignore invalid
  formal argument in keyword argument definition.
  [ruby-dev:48742] [Bug #10545]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48583 b2dd03c8-39d4-4d8f-98ff-823fe69b080e