[Issue 19190] Circular reference error resolved by getting allMembers

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19190

--- Comment #5 from Yuxuan Shui <yshuiv7 at gmail.com> ---
This code even triggers an "Error: unknown":

https://run.dlang.io/is/ntQYrl

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