On 11/07/2022 19:41, Alan Ruttenberg wrote:
Anyone know this area of the compiler? It's very frustrating during development.
Interesting. The rationale is performance apparently. CLTL2: 19.2. How to Use Defstruct https://www.cs.cmu.edu/Groups/AI/html/cltl/clm/node170.html whose last four paragraphs explain the reason. It concludes with: "The defstruct feature is intended to provide ``the most efficient'' structure class. CLOS classes defined by defclass allow much more flexible structures to be defined and redefined."
---- If you want flexibility, but also don't want to use classes instead of structs everywhere, one solution may be to define your own defstruct macro in some package that produces a class and functions/methods. Import and use that defstruct during development, but switch over to the real one when development ends (assuming you want its performance).
Seems we ought to, at least, be able to blow away all traces of the defstruct, ignoring existing structures and redefine it.
CLTL2 above agrees in its last para, "Programming environments are allowed and encouraged to permit defstruct redefinition, [...]" so it sounds like you'll have made ABCL better once your structure-definition approach succeeds. Others on this list will know more about this area and the errors you're seeing.
Vibhu