merge revision(s) 58561: [Backport #13540]
parse.y: make shared string modifiable * parse.y (dedent_string): ensure that the string is modifiable, not to set the length of shared string. [ruby-core:80987] [Bug #13540]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@59513 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 58561: [Backport #13540]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@59513 b2dd03c8-39d4-4d8f-98ff-823fe69b080e