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child may be null because foldTree may exit early, without spawning a child. returnValue will be null when the frame is first created, and filled in when the frame is done executing.
In 2024, Cuban-Americans in Miami held protests in support of political prisoners held in Cuban jails, while campaigning for Donald Trump's return to the White House
After a bit of poking, I found what looked to be a textbook quartz crystal resonant curve, but centered at 20 MHz rather than 10. This suggests there’s a divide-by-two in the driver circuit, perhaps to improve the duty cycle to a more perfect 50%. But more importantly, it suggests that neither the crystal itself, nor the electrical connections between it and the package (since I was probing at the package contacts and not the surface of the quartz), were the source of the failure.