Invariant Synthesis#120
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Switches from a pinned git revision to a local submodule path so the z3.rs sources are available for local modifications.
Adds a LitKind::Int variant, with parsing and SMT translation support.
Adds optional lower/upper bound ranges to parameters and variable declarations and restrict counterexamples to that range.
Adds a syn func declaration form for marking functions as synthesis targets.
Fully unwrapped nested casts in a single visitor pass.
Adds a nonneg_cast intrinsic that reinterprets a signed Int/Real as UInt/UReal. It's an unchecked cast that requires the user to ensure the validity themselves.
Adds SMT handlers for [cond] in Int, UInt, Real, and UReal contexts, encoding them as branch-on-condition with 0/1 values.
Introduces NeutralsRemover, which eliminates zero/infinity neutral elements using SMT-guided rewrites. Wires it into the quantitative proving pipeline and makes TyCtx references immutable throughout.
Adds a synth command that runs a counterexample-guided inductive synthesis (CEGIS) loop to find function bodies using templates.
Replaces the as_i64() fallback with string-based parsing of Z3's debug representation, handling integers and rationals that do not fit in a 64-bit signed integer.
Adds HeyVL test cases for invariant synthesis across four benchmark families: cegispro, ecoimp, polynomial, and seq_loops.
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Adds template-based CEGIS invariant synthesis (
caesar synth).Also adds: signed integer literals, range syntax for variables,
nonneg_cast, aNeutralsRemoveroptimizer, and a fix to z3rro model evaluation for large/negative values.Note: The z3.rs submodule switch was needed to use a newer Z3 version that fixes a bug affecting this feature. I'm not sure if this is the right way to do it.