[Issue 21731] SumType should provide convenient access to the type index

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21731

--- Comment #4 from dlangBugzillaToGithub <robert.schadek at posteo.de> ---
THIS ISSUE HAS BEEN MOVED TO GITHUB

https://github.com/dlang/phobos/issues/10459

DO NOT COMMENT HERE ANYMORE, NOBODY WILL SEE IT, THIS ISSUE HAS BEEN MOVED TO
GITHUB

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