Do any other languages already have this feature?

Can you show some actual real-life code that would benefit from this, as
opposed to pretend code like:

    foo(bar=, qux=)

I think that if I had seen this syntax as a beginner, I would have had
absolutely no idea how to interpret it. I probably would have decided
that Python was an unreadably cryptic language and gone on to learn
something else.

Of course, with 20+ years of experience reading and writing code, I
know better now. I would interpret it as setting bar and qux to some
kind of Undefined value.

I am very sympathetic to the rationale:

"it is quite common to find code that forwards keyword parameters having
to re-state keyword arguments names"

and I've discussed similar/related issues myself, e.g. here:

https://mail.python.org/pipermail/python-list/2018-February/881615.html

But I am not convinced that adding magic syntax to implicitly guess the
value wanted as argument if it happens to match the parameter name is a
good design feature.

Is being explicit about the value that you are passing to a parameter
really such a burden that we need special syntax to avoid stating what
value we are using as the argument?

I don't think it is. And I would far prefer to read explicit code like
this:

    # Slightly modified from actual code.
    self.do_something(
        meta=meta,
        dunder=dunder,
        private=private,
        invert=invert,
        ignorecase=ignorecase,
        )

over the implicit version:

    # Looks like code I haven't finished writing :-(
    self.do_something(meta=, dunder=, private=, invert=, ignorecase=)


Out of the millions of possible values we might pass, I don't think that
the func(spam=spam) case is so special that we want to give it special
syntax.

--
Steven
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