[ruby-core:97653] [Ruby master Feature#16746] Endless method definition

Issue #16746 has been updated by shevegen (Robert A. Heiler).


> I'm paranoid that the ends end Ruby. I hope Ruby is endless.

With so many cancellations of events this year, we may not want to
want to jinx ruby too much for the 3.0 release this year because 
then 3.0 itself may become the endless version! (Or we could skip
it, like PHP skipped a version ... I was briefly tempted to propose
this on this special day today, but I really don't want to jinx
it. I do, however had, remember matz joking last year about unforeseen
events ... now I hope I just did not jinx it!)

----------------------------------------
Feature #16746: Endless method definition
https://bugs.ruby-lang.org/issues/16746#change-84850

* Author: mame (Yusuke Endoh)
* Status: Open
* Priority: Normal
----------------------------------------
Ruby syntax is full of "end"s.  I'm paranoid that the ends end Ruby.  I hope Ruby is endless.

So, I'd like to propose a new method definition syntax.

```ruby
def: value(args) = expression
```

As you see, there is no "end".

Examples.

```ruby
def: hello(name) =
  puts("Hello, #{ name }")

hello("endless Ruby") #=> Hello, endless Ruby
```

```ruby
def: inc(x) = x + 1

p inc(42) #=> 43
```

```ruby
x = Object.new

def: x.foo = "FOO"

p x.foo #=> "FOO"
```

```ruby
def: fib(x) =
  x < 2 ? x : fib(x-1) + fib(x-2)

p fib(10) #=> 55
```

Limitations.

* `def: foo x = x` is invalid; the parentheses for formal arguments are mandatory.
* `private def: foo = x` is invalid; this method definition cannot be an method argument.

A patch is attached.  No conflicts.

---Files--------------------------------
endless-method-definition.patch (2.99 KB)


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