> On Dec 27, 2015, at 7:25 PM, David Kastrup <d...@gnu.org> wrote:
>
>> (2)
>> The doc-string for `stencil-whiteout' implies that @var{thickness} is
>> optional. As far as I understand it's not.
You’re right that the doc-string is misleading. @var{thickness} is required as
an argument but if its value is not a number then an appropriate value is
selected based on @var{style}. If the user hasn’t explicitly specified a
number for the thickness of the whiteout, then this procedure is called with an
empty/null/non-number value for @var{thickness}.
> Should it be? Would that have saved us from the error?
I don’t think it would have prevented this error but it probably makes sense to
make it an optional argument. I’ll prepare a patch for that so the code will
match the doc string.
-Paul
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