[ruby-core:96362] [Ruby master Bug#16438] Check warning messages for Ruby 2.7

Issue #16438 has been updated by ko1 (Koichi Sasada).


```ruby
$SAFE = 1
#=> t.rb:1: warning: $SAFE will become a normal global variable in Ruby 3.0
```

> # no warning

pls check current master.

----------------------------------------
Bug #16438: Check warning messages for Ruby 2.7
https://bugs.ruby-lang.org/issues/16438#change-83272

* Author: ko1 (Koichi Sasada)
* Status: Open
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
* Target version: 2.7
* ruby -v: 
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
Please check Ruby 2.7 new introduced warning messages.

* deprecation warning

```ruby
def foo(**kw)
end

foo({}) #=> test.rb:4: warning: The last argument is used as the keyword parameter
        #   test.rb:1: warning: for `foo' defined here; maybe ** should be added to the call?
# deafult: on
```

```ruby
_1 = 2
#=>
# t.rb:1: warning: `_1' is used as numbered parameter

# default: on
```

```ruby
def _1; end
#=> test.rb:1: warning: `_1' is used as numbered parameter

# deafult: on
# added at Today!!
```

```ruby
def foo
  proc.call #=> 1
end

foo{p 1}
#=>
# t.rb:2: warning: Capturing the given block using Kernel#proc is deprecated; use `&block` instead
# 1

# default: on
```

```ruby
$; = //
#=> t.rb:1: warning: non-nil $; will be deprecated

$, = ''
#=> t.rb:2: warning: non-nil $, will be deprecated

# default: on
```

```ruby
   def foo
     class << Object.new
       yield
     end
   end
   foo { p :ok } #=> warning: `yield' in class syntax will not be supported from Ruby 3.0.

# default: on
```

```ruby
require 'open-uri'
open('http://atdot.net')
#=> test.rb:2: warning: calling URI.open via Kernel#open is deprecated, call URI.open directly or use URI#open

# default: on
```

* experimental feature

```
$ ./miniruby -e 'case 1; in 1; end'
-e:1: warning: Pattern matching is experimental, and the behavior may change in future versions of Ruby!

# default: on
```




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