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When `proc change` bound new local variables, both generated subgoals were ill-formed: the local-equivalence goal carried the fresh local in the memtype of the original (un-replaced) fragment, and the continuation goal rewrote the side to a statement using the fresh local while keeping the un-extended memtype, leaving a program that referenced a variable absent from its memory type. Thread the extended memtype to the side that runs the replacement: in the local-equivalence goal it goes on the right (the new fragment) while the left keeps the original memtype; in the continuation goal it goes on the rewritten side. `hl_set_stmt` gains an optional `?mt` to override the active side's memtype.
fdupress
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Jun 10, 2026
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Should we add unit tests for the memtype-changing variants of proc change?
This does fix the problem also in the context of my broader proof, so the fix is verified for me.
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Closes #1026.
When
proc changebound new local variables, both generated subgoalswere ill-formed: the local-equivalence goal carried the fresh local in
the memtype of the original (un-replaced) fragment, and the continuation
goal rewrote the side to a statement using the fresh local while keeping
the un-extended memtype, leaving a program that referenced a variable
absent from its memory type.
Thread the extended memtype to the side that runs the replacement: in
the local-equivalence goal it goes on the right (the new fragment) while
the left keeps the original memtype; in the continuation goal it goes on
the rewritten side.
hl_set_stmtgains an optional?mtto override theactive side's memtype.