[ruby-core:91725] [Ruby trunk Bug#15647] Disallow "in" as a keyword argument name

Issue #15647 has been updated by nobu (Nobuyoshi Nakada).

Status changed from Open to Rejected
Description updated

It is known that reserved words can be keyword arguments.
And `Binding#local_variable_get` has been added for that purpose, `if` argument for instance.

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Bug #15647: Disallow "in" as a keyword argument name
https://bugs.ruby-lang.org/issues/15647#change-77000

* Author: localhostdotdev (localhost .dev)
* Status: Rejected
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-darwin17]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
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"`in`" is a reserved keyword and thus can't be accessed directly anyway.

e.g. the following is a syntax error:

```ruby
def m(in:); p in; end; m(in: 1)
```

And as usual, doing `in = 1` doesn't work.

"`in`" could still be passed as a keyword argument if using some kind of catch-all, e.g. `m(args)`, `m(*args)`, etc.

Source: https://twitter.com/drbrain/status/1104152696339087361



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