On Wed, 2 May 2012, Nick Piggin wrote:

Because it needs to be an ongoing thing, which is caught as soon as the
developer writes some code, rather than continually audited for and fixed
up after the fact. There is not a good way to enforce this at compile time.

The existing callers do need to be fixed too, of course.

I'm asking that existing callers be fixed up before such a warning is 
introduced.

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