Re: Saving a project in Etoys

Hi Edwin,

are you using Squeak 6.0? It seems we already fixed that issue in the latest version of the Squeak (the trunk): https://lists.squeakfoundation.org/archives/list/[email protected]/message/L4CQRDRU6TSTSHC3V52BBZ2IYNU6SPSX/ Hm ... we could backport that fix to 6.0 ...
Anyway, glad you discovered this solution by yourself. :-)

> Both solutions lead to a next error, but I would like to solve this one first.

It sounds as if you already solved the bug correctly yourself.

> So, could someone tell me if a compiledBlock can have instance variables or not?

Instance variable belong to a class, not to a method or block. But yes, any kind of compiled code objects, i.e. compiled methods and compiled blocks, can reference instance variables via certain bytecode instructions. Here is one example of many:

Bag>>sortedCounts
      "Answer with a collection of counts with elements, sorted by decreasing
      count."

      ^(Array new: contents size streamContents: [ :stream |
            contents associationsDo: [ :each |
                  stream nextPut: each value -> each key ] ])
            sort: [:x :y | x >= y ];
            yourself

Here, the compiled block [ :stream | ....] references the instance variable contents of the receiver.

(To find all examples of such blocks, you could try this snippet:
(self systemNavigation allMethodsSelect: [:m | true]) gather: [:m | m compiledMethod codeLiterals select: [:ea | (ea isKindOf: CompiledBlock) and: [ea hasInstVarRef]]])

HTH! If you experience any other issues, please let us know!

Best,
Christoph
________________________________
Von: Edwin Ancaer <[email protected]>
Gesendet: Mittwoch, 27. Mai 2026 16:51 Uhr
An: The general-purpose Squeak developers list <[email protected]>
Betreff: [squeak-dev] Saving a project in Etoys

Hello,

when saving a project in Etoys, I allways get the error: MessageNotUnderstood: CompiledBlock>>hasInstVarRef.

And indeed, there is no method hasInstVarRef in the class CompiledBlock. There is one in CompiledMethod however. This makes me suppose that there once was a method hasInstVarRef in CompiledBlock, and it has been removed.

Maybe because a compiledBlock cannot have instance variables?
In that case , can I define a method hasInstVarRef that returns false in CompiledBlock?

On the other hand, if I copy the method hasInstVarRef from CompiledMethod to CompiledBlock, that in itself works also.

Both solutions lead to a next error, but I would like to solve this one first. So, could someone tell me if a compiledBlock can have instance variables or not?

Kind regards,

Edwin Ancaer




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