https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121053
Tomasz Kamiński <tkaminsk at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |tkaminsk at gcc dot gnu.org
--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
The first form is SFINAE because computing its return type can fail; I don't
see anything that allows SFINAE for the second form, but perhaps I'm just
unfamiliar with library conventions.
--- Comment #4 from Tomasz Kamiński <tkaminsk at gcc dot gnu.org> ---
I believe that the following `Constrains`
https://eel.is/c++draft/variant#visit-2 implies that Variant has single
accessible `variant` specialization base.
