[ruby-core:75588] [Ruby trunk Bug#10708] In a function call, double splat of an empty hash still calls the function with an argument

Issue #10708 has been updated by Shyouhei Urabe.


Matz is positive about #12157 (removal of optional hash parameters).

If that request is to be accepted,  this double-splat problem should be solved beforehand.  The bug here sources from hash / kwargs confusion so a clear distinction between them is mandatory.

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Bug #10708: In a function call, double splat of an empty hash still calls the function with an argument
https://bugs.ruby-lang.org/issues/10708#change-58722

* Author: Damien Robert
* Status: Assigned
* Priority: Normal
* Assignee: Yukihiro Matsumoto
* ruby -v: ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
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Consider this:

~~~ruby
def foo; end
foo(*[]) #Splatting an empty list is ok
foo(**{}) #Double splatting an empty hash is like calling foo({}) which gives an error
~~~

This is annoying in a function that is a wrapper around another function and just process some keywords:

~~~ruby
def wrapper(*args, keyword: true, **others)
  puts keyword
  wrappee(*args,**others) #here this code will fail if others is empty
end
~~~




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