ruby-core

Issue #16371 has been updated by matz (Yukihiro Matsumoto).


I think this inconsistency is a bug. Double splat in hash expressions needs to work as interpolation.

Matz.


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Bug #16371: Inconsistent usage of Double splat operator
https://bugs.ruby-lang.org/issues/16371#change-82805

* 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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