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In the process of debugging the last couple of commits (though I no
longer remember exactly how) I noticed that 'wait-for-routine' only
waits until the target routine stops running for any reason, including
when it blocks on something. That's not the synchronization primitive we
want in production code, even if it's necessary for some scenarios like
'buffer-lines-blocks-until-newline'. So we rename the old 'wait-for-routine'
primitive to 'wait-for-routine-to-block', and create a new version of
'wait-for-routine' that say callers of 'start-writing' can safely use,
because it waits until a target routine actually completes (either
successfully or not).

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