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FutureVar[T] is a new distinct Future type which is designed to be used for situations where the highest performance is needed. It reduces the number of Future allocations needed. It acts as a replacement for 'var' params in async procs. This commit modifies @def-'s PR in order to make it safer. The recvLineInto procedure has been modified to take a ``FutureVar[string]`` param instead of a ``ptr string`` param.