Feature or enhancement

Proposal:

Currently, with# doctest: +ELLIPSIS, a... can match anything. Sometimes, we want to test that a test matches a literal ellipsis.

I propose something similar to<LITERAL ELLIPSIS>. Possibly guarded behind another doctest flag.

'''>>> '123...456' # doctest: +ELLIPSIS'123<LITERAL ELLIPSIS>456''''

Motivation: SageMath doctest. Seesagemath/sage#41276 .

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response