ruby - How can I prevent a positional argument from being expanded into keyword arguments? -

i'd have method accepts hash , optional keyword argument. tried defining method this:

def foo_of_thing_plus_amount(thing, amount: 10)   thing[:foo] + amount end

when invoke method keyword argument, works expect:

my_thing = {foo: 1, bar: 2} foo_of_thing_plus_amount(my_thing, amount: 20) # => 21

when leave out keyword argument, however, hash gets eaten:

foo_of_thing_plus_amount(my_thing) # => argumenterror: unknown keywords: foo, bar

how can prevent happening? there such thing anti-splat?

this bug fixed in ruby 2.0.0-p247, see this issue.

Camp