kwarg.rb

def meth(arg, **kwargs)
  puts "kwargs: #{kwargs}"
end

puts '---- no warning ----'
meth(1, hoge: 1) #=> no warning
meth(1, **{ hoge: 1 }) #=> no warning
send(:meth, *[1, **{hoge: 1}]) # => NO warning

puts '---- warning ----'
meth(1, { hoge: 1 }) #=> warning
meth(*[1, { hoge: 1 }]) #=> warning
meth(*[1, **{ hoge: 1 }]) #=> warning
send(:meth, 1, {hoge: 1}) # => warning
send(:meth, *[1, {hoge: 1}]) # => warning