From: matz@...
Date: 2016-07-19T09:10:52+00:00
Subject: [ruby-core:76440] [Ruby trunk Feature#12543][Closed] explicit tail call syntax: foo() then return

Issue #12543 has been updated by Yukihiro Matsumoto.

Status changed from Open to Closed

I am not positive. This may not work under tracing. I am for adding tail-call optimization, but Koichi do not love the idea either.

Matz.

----------------------------------------
Feature #12543: explicit tail call syntax: foo() then return
https://bugs.ruby-lang.org/issues/12543#change-59686

* Author: Yusuke Endoh
* Status: Closed
* Priority: Normal
* Assignee: Yukihiro Matsumoto
----------------------------------------
How about introducing a new syntax for tail call?

```
def foo()
  foo()
end
foo() #=> stack level too deep
```

```
def bar()
  bar() then return
end
bar() #=> infinite loop
```

* no new keyword (cf. `goto foo()`)
* no conflict with any existing syntax
* an experimental patch is available (attached)
* no shift/reduce nor reduce/reduce conflict in parse.y

-- 
Yusuke Endoh <mame@ruby-lang.org>

---Files--------------------------------
then_return.patch (9.18 KB)


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