Implements argument processing for return values.
# File lib/gir_ffi/builder/argument.rb, line 482 def cvar callarg end
# File lib/gir_ffi/builder/argument.rb, line 490 def inarg nil end
# File lib/gir_ffi/builder/argument.rb, line 486 def retname @retname ||= @var_gen.new_var end