[ruby-core:89066] [Ruby trunk Bug#15078] Hash splat of empty hash should not create a positional argument.

Issue #15078 has been updated by akr (Akira Tanaka).


akr (Akira Tanaka) wrote:

> If it is not acceptable, I have second idea:

My third idea is to use an instance variable to distinguish
the two kind of `{}`.

We can create `{}` with a special instance variable to distinguish them.

```
h = {}
h.instance_variable_set(:@no_keyword_arguments, true)
```

It can be detected as `h.instance_variable_defined?(:@no_keyword_arguments)`.

This is almost compatible, I think.


----------------------------------------
Bug #15078: Hash splat of empty hash should not create a positional argument.
https://bugs.ruby-lang.org/issues/15078#change-74089

* 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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