std.algorithm.startsWith only predicate

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On Sunday, 18 October 2015 at 21:44:57 UTC, Jonathan M Davis 
wrote:
> startsWith doesn't have an overload that takes only a 
> predicate. The existing overloads all require at least one 
> "needle" to search for in the "haystack." An overload that 
> doesn't require a needle could certainly be added, but there 
> isn't one right now.
>
> - Jonathan M Davis

https://github.com/D-Programming-Language/phobos/pull/3752