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-(** The "symbolic" AST is the AST directly generated by the symbolic execution.
-    It is very rough and meant to be extremely straightforward to build during
-    the symbolic execution: we later apply transformations to generate the
-    pure AST that we export. *)
-
-module T = Types
-module V = Values
-module E = Expressions
-module A = LlbcAst
-
-(** "Meta"-place: a place stored as meta-data.
-
-    Whenever we need to introduce new symbolic variables, for instance because
-    of symbolic expansions, we try to store a "place", which gives information
-    about the origin of the values (this place information comes from assignment
-    information, etc.).
-    We later use this place information to generate meaningful name, to prettify
-    the generated code.
- *)
-type mplace = {
-  bv : Contexts.binder;
-      (** It is important that we store the binder, and not just the variable id,
-          because the most important information in a place is the name of the
-          variable!
-       *)
-  projection : E.projection;
-      (** We store the projection because we can, but it is actually not that useful *)
-}
-
-type call_id =
-  | Fun of A.fun_id * V.FunCallId.id
-      (** A "regular" function (i.e., a function which is not a primitive operation) *)
-  | Unop of E.unop
-  | Binop of E.binop
-[@@deriving show, ord]
-
-type call = {
-  call_id : call_id;
-  abstractions : V.AbstractionId.id list;
-  type_params : T.ety list;
-  args : V.typed_value list;
-  args_places : mplace option list;  (** Meta information *)
-  dest : V.symbolic_value;
-  dest_place : mplace option;  (** Meta information *)
-}
-
-(** Meta information, not necessary for synthesis but useful to guide it to
-    generate a pretty output.
- *)
-
-type meta =
-  | Assignment of mplace * V.typed_value * mplace option
-      (** We generated an assignment (destination, assigned value, src) *)
-
-(** **Rk.:** here, {!expression} is not at all equivalent to the expressions
-    used in LLBC: they are a first step towards lambda-calculus expressions.
- *)
-type expression =
-  | Return of V.typed_value option
-      (** There are two cases:
-          - the AST is for a forward function: the typed value should contain
-            the value which was in the return variable
-          - the AST is for a backward function: the typed value should be [None]
-       *)
-  | Panic
-  | FunCall of call * expression
-  | EndAbstraction of V.abs * expression
-  | EvalGlobal of A.GlobalDeclId.id * V.symbolic_value * expression
-      (** Evaluate a global to a fresh symbolic value *)
-  | Expansion of mplace option * V.symbolic_value * expansion
-      (** Expansion of a symbolic value.
-    
-          The place is "meta": it gives the path to the symbolic value (if available)
-          which got expanded (this path is available when the symbolic expansion
-          comes from a path evaluation, during an assignment for instance).
-          We use it to compute meaningful names for the variables we introduce,
-          to prettify the generated code.
-       *)
-  | Meta of meta * expression  (** Meta information *)
-
-and expansion =
-  | ExpandNoBranch of V.symbolic_expansion * expression
-      (** A symbolic expansion which doesn't generate a branching.
-          Includes:
-          - concrete expansion
-          - borrow expansion
-          *Doesn't* include:
-          - expansion of ADTs with one variant
-       *)
-  | ExpandAdt of
-      (T.VariantId.id option * V.symbolic_value list * expression) list
-      (** ADT expansion *)
-  | ExpandBool of expression * expression
-      (** A boolean expansion (i.e, an [if ... then ... else ...]) *)
-  | ExpandInt of
-      T.integer_type * (V.scalar_value * expression) list * expression
-      (** An integer expansion (i.e, a switch over an integer). The last
-          expression is for the "otherwise" branch. *)