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Thanks Caleb for finding this. We'd been using sandboxes for so long, I
hadn't tried a null/0 screen/console in a while and somewhere down the
road Mu stopped matching 0 against concrete addresses.
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Turns out we don't need a primitive to return an empty value of
arbitrary type. Just create it on the heap using 'new'.
But this uncovered *yet* another bug, sigh. When I specialize generic
functions I was running all transforms on the generated functions after
specialization completed. But there's one transform that includes code
from elsewhere. If such code included type-ingredients -- kaboom. Now
fixed and there's a test, so I've got that going for me which is nice.
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Now that we no longer have non-shared addresses, we can just always
track refcounts for all addresses.
Phew!
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Issue 1 in 2829 is now fixed.
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1. It turns out we couldn't overload 'get' and 'get-address' until now,
because transform_names looks for those names, and the
resolve_ambiguous_calls transform happens before transform_names. Why
does resolve_ambiguous_calls happen before transform_names? Because if
my students made mistakes in the ingredients to an instruction they got
overzealous errors from resolve_ambiguous_calls. Now this impacts 'put'
as well, which is already overloaded for tables. Not sure what to do
about this; I'm going to go back to the overzealous errors, and just
teach students to visually scan past them for now.
2. I need addresses in a third place besides storing to containers and
arrays, and managing the heap -- to synchronize routines.
wait-for-location requires an address. Not sure what to do about this..
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Show more thorough information about instructions in the trace, but keep
the original form in error messages.
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As outlined at the end of 2797. This worked out surprisingly well. Now
the snapshotting code touches fewer layers, and it's much better
behaved, with less need for special-case logic, particularly inside
run_interactive(). 30% slower, but should hopefully not cause any more
bugs.
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