merge revision(s) ac00bdc8a8ac2c62a94dd36a7784d15bbcb7df19: [Backport #15821]
Do not modify shared array [Bug #15821]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_5@67759 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) ac00bdc8a8ac2c62a94dd36a7784d15bbcb7df19: [Backport #15821]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_5@67759 b2dd03c8-39d4-4d8f-98ff-823fe69b080e