[Issue 6949] no warning or error if unsigned variable is compared to 0

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6949



--- Comment #11 from bearophile_hugs at eml.cc 2012-11-29 20:15:15 PST ---
(In reply to comment #10)

> Some languages, such as Java, deal with this duality by defining the unsigned
> type out of existence.

There are languages like Ada, that have both signed and unsigned native
integrals, but behave differently from C/C++/D.

(Even if this patch is eventually refused, I suggest to turn it into a warning
and compile all phobos one time again with "-wi" to look for possible bugs
spotted by this.)

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