Ruby » Ruby master

Feature #17121

Updated by S_H_ (Shun Hiraoka) over 3 years ago

`ENV#index` is deprecated since `ruby-1.9.0-0`. 

 So, remove it. 

 ```bash 
 root@8785b339158a:/all-ruby#    env ALL_RUBY_SINCE=ruby-1.8 ./all-ruby -e 'ENV.index("RUBY")' 
 ruby-1.8.0 
 ... 
 ruby-1.8.7-p374 
 ruby-1.9.0-0            -e:1: warning: ENV.index is deprecated; use ENV.key 
 ... 
 ruby-2.7.0-rc1          -e:1: warning: ENV.index is deprecated; use ENV.key 
 ruby-2.7.0-rc2          -e:1: warning: ENV.index is deprecated; use ENV.key instead 
 ... 
 ruby-2.7.1              -e:1: warning: ENV.index is deprecated; use ENV.key instead 

 ``` 

 pull request: 
 https://github.com/ruby/ruby/pull/3415

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