On Wednesday, 29 April 2015 at 04:38:12 UTC, Steven Schveighoffer
wrote:
FYI, Andrei and Walter are reversing this change barring any
new evidence it's helpful to people. Please speak up if you
disagree.
https://github.com/D-Programming-Language/dmd/pull/2885#issuecomment-97299912
-Steve
I don't have precise number to show, but I've been bitten by if
(arr) doing null check rather than length check more than once.
The most problematic part of it is that it is frequent to have
empty slice having a null pointer, so the code is likely to pass
testing, while not doing what you expect it to do, and will break
later in some bizarre way.
More generally, it is a identity vs equality problem. Slices have
a semantic where equality is not identity ( == is different than
is ) so the current behavior is inconsistent.
