[Issue 10124] Array length increases on subtraction of a big number instead of throwing RangeError

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=10124

Marco Leise <Marco.Leise at gmx.de> changed:

           What    |Removed                     |Added
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                 CC|                            |Marco.Leise at gmx.de

--- Comment #3 from Marco Leise <Marco.Leise at gmx.de> ---
I see it like the others, Denis. Detecting overflow/underflow here is no
different than on regular integer math in other places. The compiler's rewrite
looks fine to me. If anything, we need a generic integer overflow check placed
around integer math.

Same goes for `arr.length -= -1': Again, this is how the language works. Mixing
signed and unsigned is allowed, as is `a - (-1)'. While I am positive on these
features in general as a nice-to-have, I think this bug report on array.length
is invalid and too narrow. Consider for example some custom struct exposing
some .length similar to arr.length, which would not be affected by a fix to
this bug. We would get different semantics where we are striving to unify the
experience.

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