[ruby-core:93940] [Ruby master Bug#16024] String#split with block. cannot use Regexp in the block.

Issue #16024 has been reported by tksotn (TAKASHI OOTANI).

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Bug #16024: String#split with block. cannot use Regexp in the block.
https://bugs.ruby-lang.org/issues/16024

* Author: tksotn (TAKASHI OOTANI)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-linux]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
$ ruby -v
ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-linux]
$ cat foo
str = "aaa,bbb;ccc,ddd"
n=0
str.split(/[;,]/) do |word|
    n+=1
    p [n,word.gsub(/\w/,"A")]
end
$ ruby foo
[1, "AAA"]
[2, "\u0000AAA,AAA;AAA,AAA"]
$

### expected output:
[1, "AAA"]
[2, "AAA"]
[3, "AAA"]
[4, "AAA"]

$ cat bar
str = "aaa\nb\nccc\nddd\n"
n=0
str.split(/\n/) do |line|
    n+=1
    p [n,line.gsub(/.*/,"A")]
end
$ ruby bar
=> infinite loop




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