[Issue 21169] make checkedint as a drop-in replacement of native int/long

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21169

--- Comment #2 from Dlang Bot <dlang-bot at dlang.rocks> ---
@quickfur created dlang/phobos pull request #7599 "std.experimental.checkedint
should support chain assignment." mentioning this issue:

- std.experimental.checkedint should support chain assignment.

  Cf. bug #21169.

https://github.com/dlang/phobos/pull/7599

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