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Go/OCaml API gaps: substitution, AST introspection, Spacer, Goal completion (#9277)

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* fix: address issues 1,2,4,5 and add Goal API to Go bindings

Issue 2 (Go): Add Substitute, SubstituteVars, SubstituteFuns to Expr
Issue 4 (Go): Add GetDecl, NumArgs, Arg to Expr for AST app introspection
Goal API (Go): Add IsInconsistent and ToDimacsString to Goal
ASTVector (Go): Add public Size, Get, String methods
ASTMap (Go): Add ASTMap type with full CRUD API in spacer.go
Issue 1 (Go): Add Spacer fixedpoint methods QueryFromLvl, GetGroundSatAnswer,
  GetRulesAlongTrace, GetRuleNamesAlongTrace, AddInvariant, GetReachable
Issue 1 (Go): Add context-level QE functions ModelExtrapolate, QeLite,
  QeModelProject, QeModelProjectSkolem, QeModelProjectWithWitness
Issue 5 (OCaml): Add substitute_funs to z3.ml and z3.mli

Agent-Logs-Url: https://github.com/Z3Prover/z3/sessions/afa18588-47af-4720-8cea-55fe0544ae55

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

* fix: add substitute_funs to Expr module sig in z3.ml

The internal sig...end block in z3.ml (the module type declaration for Expr)
was missing val substitute_funs, causing OCaml compiler error:
  The value substitute_funs is required but not provided

Agent-Logs-Url: https://github.com/Z3Prover/z3/sessions/c6662702-46a3-4aa0-b225-d6b73c2a2505

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
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Copilot 2026-04-12 14:00:03 -07:00 • committed by GitHub
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8
src/api/ml/z3.ml
View file

@ -475,6 +475,7 @@ sig
val substitute : expr -> expr list -> expr list -> expr
val substitute_one : expr -> expr -> expr -> expr
val substitute_vars : expr -> expr list -> expr
val substitute_funs : expr -> FuncDecl.func_decl list -> expr list -> expr
val translate : expr -> context -> expr
val to_string : expr -> string
val is_numeral : expr -> bool
@ -537,6 +538,13 @@ end = struct
let substitute_vars x to_ =
Z3native.substitute_vars (gc x) x (List.length to_) to_
let substitute_funs x from to_ =
let len = List.length from in
if List.length to_ <> len then
raise (Error "Argument sizes do not match")
else
Z3native.substitute_funs (gc x) x len from to_
let translate (x:expr) to_ctx =
if gc x = to_ctx then
x

4
src/api/ml/z3.mli
View file

@ -531,6 +531,10 @@ sig
For every [i] smaller than [num_exprs], the variable with de-Bruijn index [i] is replaced with term [to[i]]. *)
val substitute_vars : Expr.expr -> Expr.expr list -> expr
(** Substitute every application of [from[i]] with [to[i]] in the expression.
The [from] and [to] lists must have the same length. *)
val substitute_funs : Expr.expr -> FuncDecl.func_decl list -> Expr.expr list -> expr
(** Translates (copies) the term to another context.
@return A copy of the term which is associated with the other context *)
val translate : Expr.expr -> context -> expr