For me exception is a language construct - a flow of logic. While what is an error and what is 'normal failure' is defined by a particular program. I would rather expect that you'll find many situations other than error conditions where using exceptions would be beneficial. Of course you can argue that the exception construct is particulary well suited for errors, and not for 'normal failures', it just seems to me like mixing semantical levels when you distinguish between exceptions and 'normal' failures.
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