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			Function std.stdio.File.tryLock
			Attempts to lock the specified file segment.
If both  and start are zero, the entire file is locked.
length
Prototype
bool tryLock( LockType lockType = cast(LockType)1, ulong start = 0LU, ulong length = 0LU );
Returns
true if the lock was successful, and false if the
specified file segment was already locked.
Authors
Walter Bright, Andrei Alexandrescu, Alex Rønne Petersen