and used in some copying code to access indexable fields.�� Chris Muller found this in some of his Magma code and so we added a pair of new primitives, primitiveSlotAt and primitiveSlotAtPut that access any slot within the sequence of named followed by indexable inst vars, avoiding the primitive failure. So in Squeak Spur instVarAt: now reads:

instVarAt: index

"Primitive. Answer a fixed variable in an object. The numbering of the variables

corresponds to the named instance variables, followed by the indexed instance

variables. Fail if the index is not an Integer or is not the index of a fixed variable.

Essential. See Object documentation whatIsAPrimitive."

<primitive: 173 error: ec>

self primitiveFailed