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Thanks to Michael Forney for spotting this
oversight and providing the test case.
Note: because esc() leaves ABot unchanged,
the assertion "a->type == ABot" on line 122
remains valid.
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Symbols in the source file are still limited in
length because the rest of the code assumes that
strings always fit in NString bytes.
Regardless, there is already a benefit because
comparing/copying symbol names does not require
using strcmp()/strcpy() anymore.
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The previous code was buggy. It would put a stack
pointer on the heap when handling "add $foo, 42".
The new code is more straightforward and hopefully
more correct. Only temporaries with a "stack"
alias class will have a slot pointer.
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When a temporary marked local is escaping,
the whole slot must be marked as such. To
solve this, Alias now holds a pointer to
the alias information of the slot. For
simplicity of the code, this pointer is
always valid and fetching ->type out of it
is meaningful.
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