envutil.rb: optional fname

* test/ruby/envutil.rb (Test::Unit::Assertions#assert_valid_syntax):
  make fname optional for inline source.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38722 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
envutil.rb: assert_syntax_error

* test/ruby/envutil.rb (Test::Unit::Assertions#assert_syntax_error):
  new assertion for syntax error and error message.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38723 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
parse.y: duplicated kwrest name

* parse.y (f_kwrest): reject duplicated kwrest argument name.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38724 b2dd03c8-39d4-4d8f-98ff-823fe69b080e