From: Eric Wong <normalperson@...>
Date: 2017-10-16T04:06:56+00:00
Subject: [ruby-core:83306] Re: [Ruby trunk Bug#13872] Duplicate assignment no longer silences "assigned but unused variable" warning

ronnie@dio.jp wrote:
> Please upgrade your code to actually "use" all the assigned
> local variables, in this case, to `var = "foo"; var = var`.

The problem is with binding:

	require 'erb'
	foo = :bar
	puts ERB.new('<%= foo %>').result(binding)

The above uses foo, but binding isn't handled by the parser.
Maybe the parser should not warn if the word `binding'
appears in scope?  And check for local variables named
`binding'...

But yes, this is annoying with ERB when I want my code
to be warning-clean.

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