[ruby-core:96429] [Ruby master Bug#16448] regex global variables are working differently depend on scope

Issue #16448 has been reported by tdrive (Станислав sdfsdfdsfs).

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Bug #16448: regex global variables are working differently depend on scope
https://bugs.ruby-lang.org/issues/16448

* Author: tdrive (Станислав sdfsdfdsfs)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.5p114 (2019-10-01 revision 67812) [x86_64-darwin18]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
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Hi, everyone.

I am trying to write a code similar on this

``` ruby
#!/usr/bin/env ruby

def check(f1)
  f2 = ->(match) { p match; p $~ }
  
  data = "hello test test test"
  
  data.gsub(/test/, &f1)
  data.gsub(/test/, &f2)
end

check(->(match) { p match; p $~ })
```

output:
```
"test"
nil
"test"
nil
"test"
nil
"test"
#<MatchData "test">
"test"
#<MatchData "test">
"test"
#<MatchData "test">
```

ruby versions:
`ruby 2.6.5p114 (2019-10-01 revision 67812) [x86_64-darwin18]`
`ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-darwin18]`


Why the global variable (`$~`) in f1 and f2 are working differently? It's a bug or my mistake?




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