From: shevegen@...
Date: 2018-03-17T04:08:16+00:00
Subject: [ruby-core:86166] [Ruby trunk Bug#14611] Exotic method parameters	bug

Issue #14611 has been updated by shevegen (Robert A. Heiler).


I did not know that either.

I guess the problem was that bogdan was using variables with
a leading '_'.

With this:

    def x(a,a,b)
      puts 'HI'
    end

I get in IRB:

SyntaxError ((irb):1: duplicated argument name


With that, however had:

    def x(_a,_a,_b)
      puts 'hi'
    end
    x(1,2,3)
    # => hi

I get no error and the method call works.

I have no idea if this is a bug or a feature but to me,
just from looking at the above, I would have assumed that
_a is equal to _a just as a was equal (considered) above.


----------------------------------------
Bug #14611: Exotic method parameters bug
https://bugs.ruby-lang.org/issues/14611#change-71050

* Author: bogdan (Bogdan Gusiev)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.4.2
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
Consider the following code:


~~~ ruby
def test(_, x, *_)
  x
end

test(1,2,3) # => nil
~~~

By some reason second parameter is nil when the rest of parameters declared as not used.




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