>> *    def myfunc(a, b, c = yield []):
>>               pass*

>> [...], but there is no interpretation conflict for the parser, and we
>> might quickly get used to it

> I am surprised that there is no conflict, but it looks like you are
> technically right.  The parentheses around the yield expression are
> required in the following (valid) code:

>  >>> def gen():
> ...     def func(arg=(yield 'starting')):
> ...         return arg
> ...     yield func
> ...
>  >>> g = gen()
>  >>> g.next()
> 'starting'
>  >>> f = g.send(42)
>  >>> f()
> 42

> I would hate to see the meaning of the above change depending on whether
> the parentheses around the yield expression were there or not, so -1 on
> using "yield" for this.

> I'm +0 on the general idea of adding a keyword for delayed evaluation of
> default argument expressions.