[ruby-core:87330] [Ruby trunk Feature#14217] Expose RUBY_PATCHLEVEL_STR or similar with patch level info for rc/preview as a constant

From: nobu@...
Date: 2018-06-01 03:00:45 UTC
List: ruby-core #87330
Issue #14217 has been updated by nobu (Nobuyoshi Nakada).

Description updated

Could you elaborate how you want to use it?

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Feature #14217: Expose RUBY_PATCHLEVEL_STR or similar with patch level info for rc/preview as a constant 
https://bugs.ruby-lang.org/issues/14217#change-72322

* Author: shayonj (Shayon Mukherjee)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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## Problem
When ruby is in release candidate or preview, `RUBY_PATCHLEVEL` is `-1`. Without parsing `RUBY_DESCRIPTION`, its hard to tell using constant the right and absolute ruby version.

## Proposal
Expose `RUBY_PATCHLEVEL_STR` as a constant, just like `RUBY_VERSION` or `RUBY_PATCHLEVEL`. So that, we can know the right ruby version, especially when its in preview or release candidate. This is also helpful when using gems that rely on  `RUBY_PATCHLEVEL` and  `RUBY_VERSION` to serve the right experience. Example: Bundler, which validates gem installation by making sure right ruby is installed. Currently, we cannot install gems using 2.5.0preview1.


~~~
Your Ruby version is 2.5.0, but your Gemfile specified 2.5.0preview1
~~~

This can be handled in bundler through some different wokraround, but I think by exposing `RUBY_PATCHLEVEL_STR`, it will be helpful in building the appropriate solutions.



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