rbenv - warning: RUBY_HEAP_MIN_SLOTS is obsolete. Use RUBY_GC_HEAP_INIT_SLOTS instead.

gc.bash

Warning on ruby 2.6.3 after you upgrade rbenv

/Users/encore/.rbenv/versions/2.6.1/bin/ruby: warning: RUBY_FREE_MIN is obsolete. Use RUBY_GC_HEAP_FREE_SLOTS instead.
/Users/encore/.rbenv/versions/2.6.1/bin/ruby: warning: RUBY_HEAP_MIN_SLOTS is obsolete. Use RUBY_GC_HEAP_INIT_SLOTS instead.
/Users/encore/.rbenv/versions/2.6.1/bin/ruby: warning: RUBY_FREE_MIN is obsolete. Use RUBY_GC_HEAP_FREE_SLOTS instead.
/Users/encore/.rbenv/versions/2.6.1/bin/ruby: warning: RUBY_HEAP_MIN_SLOTS is obsolete. Use RUBY_GC_HEAP_INIT_SLOTS instead.
=> Booting WEBrick
=> Rails 5.2.2.1 application starting in development on http://localhost:3000
=> Run `rails server -h` for more startup options
[2019-05-21 20:03:34] INFO  WEBrick 1.4.2
[2019-05-21 20:03:34] INFO  ruby 2.6.1 (2019-01-30) [x86_64-darwin18]
[2019-05-21 20:03:34] INFO  WEBrick::HTTPServer#start: pid=3359 port=3000
^C[2019-05-21 20:04:47] INFO  going to shutdown ...
[2019-05-21 20:04:47] INFO  WEBrick::HTTPServer#start done.
Exiting
bundle exec rails s  3.71s user 2.39s system 7% cpu 1:20.50 total

$ touch $(rbenv root)/rbenv.d/exec/gc.bash
$ vim $(rbenv root)/rbenv.d/exec/gc.bash

```
if [[ `rbenv version-name` =~ ^2\.[1-9]\.[0-9]+ ]]; then
    unset RUBY_FREE_MIN
    unset RUBY_HEAP_MIN
    unset RUBY_HEAP_MIN_SLOTS
fi
```