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From: Paul Rubin <no.email@nospam.invalid>
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Subject: Re: Haskell, anyone?
Date: Sun, 15 Nov 2015 21:48:18 -0800
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Date: 2015-11-15T21:48:18-08:00
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"Nasser M. Abbasi" <nma@12000.org> writes:
> It is detected at compile time. It gives warning. So compiler
> can see at compile time the problem.

That's different, a special case that the compiler happens to be able to
figure out.  A true compile time check will refuse to compile the code
unless it can prove x+y<20, possibly with manual assistance.  Also the
lack of proof would result in an error (you can't compile the code), not
a warning.