[ruby-core:95972] [Ruby master Bug#16371] Inconsistent usage of Double splat operator

Issue #16371 has been updated by mame (Yusuke Endoh).


matz, the following is the current behaviors.  Do you mean which should be fixed?

(1) 2.7, via variable

```
b = {"b" => "b"}; p({x: "x", **b}) #=> current behavior: {:x=>"x", "b"=>"b"}
```

(2) 2.6, via variable

```
b = {"b" => "b"}; p({x: "x", **b}) #=> current behavior: hash key "b" is not a Symbol (TypeError)
```

(3) 2.7, with literal

```
p({x: "x", **{"b" => "b"}}) #=> current behavior: {:x=>"x", "b"=>"b"}
```

(4) 2.6, with literal

```
p({x: "x", **{"b" => "b"}}) #=> current behavior: {:x=>"x", "b"=>"b"}
```

----------------------------------------
Bug #16371: Inconsistent usage of Double splat operator
https://bugs.ruby-lang.org/issues/16371#change-82807

* Author: dmytro.vasin (Dmytro Vasin)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.6.0
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
Here is an issue with a weird behavior of ruby double splat operator: 

```
a = {a: 'a'}
b = {'b' => 'b'}

{x: 'x', **a}
#=> {:x=>"x", :a=>"a"}

{x: 'x', **b}
#=> TypeError (hash key "b" is not a Symbol)
```

When I do that implicitly, it works:

```
{x: 'x', **{'b' => 'b'}} 
#=> {:x=>"x", "b"=>"b"}
```

At the same time:

```
{**{'b' => 'b'}}
# TypeError (hash key "b" is not a Symbol)
```

From my point of view, it definitely works inconsistently.

Could you help with this example or give an advice? (maybe I used it incorrectly?)



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