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Fixes for Self-Validation Issues #1641

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This is a re-creation of #1545 which was only merged into my thesis branch, but should be merged generally.

It addresses bugs with our YAML witness generation from the relational privatizations that surfaced when performing self-validation on the Concrat benchmarks.

Contains:

  • Fix for issue where read_global read in from a global variable which does not exist in single-threaded mode
  • Fix for writing out invariants about stale local copy of escaped variables.

Closes #1542 and #1547.

@michael-schwarz michael-schwarz added bug unsound relational Relational analyses (Apron, affeq, lin2var) labels Dec 17, 2024
@michael-schwarz michael-schwarz added this to the v2.6.0 milestone Dec 17, 2024
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