On Tuesday, March 1, 2016 at 8:15:56 AM UTC-8, William wrote:
>
> -1 to telling users that a syntax is deprecated and will be removed, but
> planning to never remove it.
>
> +1 to executing the removal.
We can't let a lottery like this:
sage: var('foo,bar')
(foo, bar)
sage: f=foo+bar
sage: f(1)
foo + 1
go silently. The proper solution is raising an error.
We *could* special case the situation where len(f.variables()) == 1 and one
argument is given. Apart from no arguments at all, That's the only
situation that's unambiguous, as far as I know.
The problem at http://trac.sagemath.org/ticket/12070 is just misuse, so
should be resolved by improving documentation.
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