[ruby-core:91723] [Ruby trunk Bug#15647] Disallow "in" as a keyword argument name

From: localhostdotdev@...
Date: 2019-03-08 23:06:40 UTC
List: ruby-core #91723
Issue #15647 has been reported by localhostdotdev (localhost .dev).

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

* Author: localhostdotdev (localhost .dev)
* Status: Open
* 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 reversed keyword and thus can't be accessed directly anyway.

e.g. the following is a syntax error:

`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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