[ruby-core:106138] [Ruby master Feature#11256] anonymous block forwarding

Issue #11256 has been updated by mame (Yusuke Endoh).


@matz accepted this, but said that the formal argument must explicitly receive a anonymous block parameter, i.e.

```
def foo(&) = bar(&) # OK
def foo = bar(&)    # NG
```

In the future, matz wants to make it more explicit whether a method accepts a block or not.

@jeremyevans0 Could you remove my diff from your PR?

----------------------------------------
Feature #11256: anonymous block forwarding
https://bugs.ruby-lang.org/issues/11256#change-94736

* Author: bughit (bug hit)
* Status: Assigned
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
----------------------------------------
since capturing a block into a proc is slow: foo(&block)
and creating chains of blocks is kind of ugly and ultimately also inefficient: foo{yield}
why not allow block forwarding without capturing: foo(&) foo(1, 2, &)



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