From: ruby-core@...
Date: 2018-09-19T01:59:24+00:00
Subject: [ruby-core:89076] [Ruby trunk Bug#15078] Hash splat of empty hash should not create a positional argument.

Issue #15078 has been updated by marcandre (Marc-Andre Lafortune).


akr (Akira Tanaka) wrote:
> We can create `{}` with a special instance variable to distinguish them.

I'm impressed by your creativity :-)

So, would we have the following?

```
def foo(**opt)
  opt.instance_variable_get(:@no_keyword_arguments)
end

foo() # => true
foo({}) # => true ?
foo(**{}) # => false
special = {}; special.instance_variable_set(:@no_keyword_arguments, true)
foo(**special) # => true
foo(special) # => true
```

So this would influence how if it gets converted to positional argument, right?

```
def bar(*args)
  args
end

bar(**{}) # => [{}]
bar(**special) # => []
```


----------------------------------------
Bug #15078: Hash splat of empty hash should not create a positional argument.
https://bugs.ruby-lang.org/issues/15078#change-74094

* Author: marcandre (Marc-Andre Lafortune)
* Status: Open
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
* Target version: 
* ruby -v: ruby 2.6.0dev (2018-08-27 trunk 64545) [x86_64-darwin15]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
Looks like #10856 is not completely fixed, but I can't reopen it

```
def foo(*args); args; end
foo(**{}) # => []
foo(**Hash.new) # => [{}], should be []
```



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