[ruby-core:89737] [Ruby trunk Feature#15286] Proposal: Add Kernel.#expand(*args)

Issue #15286 has been reported by osyo (manga osyo).

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Feature #15286: Proposal: Add Kernel.#expand(*args)
https://bugs.ruby-lang.org/issues/15286

* Author: osyo (manga osyo)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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This is a suggestion for Hash shorthand.
* [add support for hash shorthand](https://bugs.ruby-lang.org/issues/15236)

`Kernel.#expand(*args)` is expand `local variable` and `method` to Hash.
`*args` is method or local variable names.

## Example

```ruby
def meth
  "meth"
end
a, b, c = 1, 2, 3

# #expand args is local variable or method names
# Expand to { a: a, b: b: meth: meth }
p expand(:a, :b, :meth)
# => {:a=>1, :b=>2, :meth=>"meth"}

# Error: `expand': undefined method `hoge' for main:Object (NoMethodError)
p expand(:hoge)
```

What can be expanded,

* local variable
* method

and, If there are duplicate names, prioritize local variable.

```ruby
def meth
   "meth"
end
meth = 42

p expand(:meth)
# => {:meth=>42}
```

pull request: https://github.com/ruby/ruby/pull/2006




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