[Issue 7753] Support opIndexCreate as part of index operator overloading in user-defined types

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=7753

--- Comment #5 from Sobirari Muhomori <dfj1esp02 at sneakemail.com> ---
Whoa, this feature is weird indeed. Given the declaration int[int][int] a;
a[0][0]=0 shouldn't work because the AA has no entry with key 0, so a[0] should
throw RangeError similar to how b=a[0] throws RangeError.

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