[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 #5 from mw <mingwu at gmail.com> ---
more more:

8)

Warning: struct Checked has method toHash, however it cannot be called with
shared(const(Checked!(long, Abort))) this.

--