Issue #17402 has been reported by nobu (Nobuyoshi Nakada).

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Bug #17402: Remove deprecated GC-related features
https://bugs.ruby-lang.org/issues/17402

* Author: nobu (Nobuyoshi Nakada)
* Status: Open
* Priority: Normal
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
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Are these backward compatibilities still needed?
I think no.

```
$ RUBY_FREE_MIN=1 RUBY_HEAP_MIN_SLOTS=1 ruby2.1 -e0
ruby2.1: warning: RUBY_FREE_MIN is obsolete. Use RUBY_GC_HEAP_FREE_SLOTS instead.
ruby2.1: warning: RUBY_HEAP_MIN_SLOTS is obsolete. Use RUBY_GC_HEAP_INIT_SLOTS instead.
```

```
$ ruby2.2 -e 'GC.stat(:malloc_limit)'
-e:1: warning: GC.stat keys were changed from Ruby 2.1. In this case, you refer to obsolete `malloc_limit' (new key is `malloc_increase_bytes_limit'). Please check <https://bugs.ruby-lang.org/issues/9924> for more information.
```




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