To inform it about space metadata you have to tag environments with the
function that generated them. Every function can only ever be called
with environments generated by a single function. As an assembly-like
language, mu requires closures to be called with an explicit
environment, but it warns when the environment might not be what the
function expects.
How did this work until now? The reply was being treated as a label, and
if 'write' returned nothing it would still work fine because the output
is already present, and a missing 'reply' leaves oargs as-is.
Should we do something to catch this? Perhaps we should track args
modified and check that there are oargs for them. But that seems quite
heavyweight.. Maybe we should clear oargs when missing a 'reply'?
Clear up that ancient todo.
We don't particularly care about what abstraction we write tests at, as
long as we do so at *some* layer and document the intent. That lets us
move tests up or down in the future when we know more/have better taste.
Was dropped in commit 149. But we need it for more convenient
overloading, especially now that the right way to build tagged-values is
unclear.
The original concern was that type/otype would make code harder to
'assemble' down to native. But we should be able to insert CALL
instructions to the right clause inside a function's code. So keep it
around in the toolbox.
Biggest change was to the interface to the 'sizeof' helper. Where it
used to accept either a type symbol or a cons operand, it now always
accepts an operand, though the value of the operand can be _. In the
process the implementation is radically simpler.
Also reorg'd unit tests a little, putting those for 'deref' before
'sizeof'.
Finally, I'm giving in and enabling the printing of test names as
they're run. We still need this all the time in our surgery.
