[ruby-core:98703] [Ruby master Bug#16945] Enable TCO by use of special form

Issue #16945 has been reported by x3qt (Yury Polyakov).

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Bug #16945: Enable TCO by use of special form
https://bugs.ruby-lang.org/issues/16945

* Author: x3qt (Yury Polyakov)
* Status: Open
* Priority: Normal
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
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I would like to propose to create some way to enable TCO in ruby by use of special form, like (recur)[https://clojure.org/reference/special_forms#recur].

AFAIK TCO is not enabled by default because it messes with stack traces, so by implementing some special form we will avoid changing default behavior and provide opportunity to use it at the same time.

Example:

``` ruby
def fact(n, acc = 1)
  return acc if n <= 1
  recur(n - 1, n * acc) # recursive call with TCO enabled
end
```




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