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This seemingly simple goal uncovered a little nest of bugs: it turns out
I've been awash in ambiguous labels until now. My baseline recipes in
edit.mu were clean, but they introduced duplicate <waypoints> -- and
*those* waypoints contained +jump-targets. Result: duplicate jump
targets, so that I wasn't jumping where I thought I was jumping. Somehow
I happened to be picking one of the alternatives that magically kept
these issues quiescent.
My first plan to fix this was to mangle names of all labels inside
before/after fragments, keep the jump targets private to their fragment.
But the labels also include more waypoints! Mangle those, and I can't
tangle to them anymore.
Solution: harden the convention that jump targets begin with '+' and
waypoints are surrounded by '<>'. Mangle jump targets occurring inside
before/after fragments to keep them private to their lexical fragment,
but *don't* mangle waypoints, which must remain globally accessible.
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