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Picture a bike where the central A-frame is actually a giant lockable carabiner.
The bike would be structurally unsound (possibly with a hinge) when the lock is open, so as to be unrideable unless closed.
When locked to something the bike would be impossible to steal without breaking it.
Freelock Locking Bike Frame
This has been kicking around for a while. There must be a reason no-one has put it into production... [pocmloc, Apr 19 2010]
U-Lock built into frame
Uses the frame in place of the bottom straight bar of the U-Lock. Not the same as mitxela's idea though. [swimswim, Apr 19 2010]
||I don't think that's quite the same though - for one, it's nothing like a normal bike, and two, it clearly doesn't need the lock intact in order to ride because it can fold 90 degrees anyway.
||This one could be made from a normal bike frame, just by cutting through the two main beams, welding a hinge in place on the lower one, and locking part to the other.
||[+] But, I am guessing that the reason this doesn't already exist is because of how it would affect the strength of the frame. Unless it locks together very tightly, it would result in wiggling of the frame when the bike takes impacts. Over time, that might cause the frame to wear down and break more quickly than a non-hinge frame. Still, there are in existence frames that fold and incorporate hinges into the frames. See my link for a non-hinge cousin of this idea.
||Also, you would still need something U-Lock-like with which to secure the wheels.