[Issue 259] Comparing signed to unsigned does not generate an error

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=259

--- Comment #59 from Lionello Lunesu <lio+bugzilla at lunesu.com> ---
It's currently using the C integer promotion rules, which are consistent
(they're rules after all) but far from simple.

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