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More flailing around trying to come up with the right phase ordering.
I've tried to narrow down each transform's constraints wrt transforms in
previous layers.
One issue that keeps biting me is the Type map containing empty records
because of stray [] operations. That's gotta be important.
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A new externality is starting to make its presence felt.
Until I sort this out it's going to be hard to finish making duplex-list
generic.
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Once a student has gotten used to recipes and ingredients using the
staged 'next-ingredient' approach there's no reason to avoid
conventional function headers. As an added bonus we can now:
a) check that all 'reply' instructions in a recipe are consistent
b) deduce what to reply without needing to say so everytime
c) start thinking about type parameters for recipes (generic functions!)
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At the lowest level I'm reluctantly starting to see the need for errors
that stop the program in its tracks. Only way to avoid memory corruption
and security issues. But beyond that core I still want to be as lenient
as possible at higher levels of abstraction.
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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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Finally terminate the experiment of keeping debug prints around. I'm
also going to give up on maintaining counts.
What we really need is two kinds of tracing:
a) For tests, just the domain-specific facts, organized by labels.
b) For debugging, just transient dumps to stdout.
b) only works if stdout is clean by default.
Hmm, I think this means 'stash' should be the transient kind of trace.
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Turns out it is indeed useful to insert code at multiple duplicate
labels within a single (long) recipe. Like handle-keyboard-event in
edit.mu.
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However, you can't have duplicate labels within a single recipe.
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