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Swap printing generalized objects using arc's infrastructure to be the
$-prefixed debug helper, while the erstwhile $print-key-to-host becomes
the primitive print-character to host.
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I dunno, this may all be a wild goose chase. I haven't been disciplined
in tagging in-out arguments in 'read-move' and its helpers. Maybe I
should just drop those 'nochange' oargs in 'read' and 'write'. Maybe I
should reserve output args only for return values that callers might
actually care about, and use more conventional metadata like 'const' or
'unique' or 'inout' on other args.
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I just did this in 611; what's the point of all this if tests can't stay
passing?
I don't understand why buffered-stdin.mu needs to preempt itself. stdin
and buffered-stdin somehow end up sharing a single circular buffer,
that's probably causing a race condition.
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Chessboard now *almost* handles backspace perfectly.
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We need the hack of printing characters typed to screen right after we
see them. But only when it's the real screen. And there's no way to
write a test for that because it explicitly shouldn't happen for fake
terminals :(
Never mind, we'll be able to test it when we provide some mechanism for
suppressing print. The equivalent of 'stty -echo'.
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