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diff --git a/src/Synthesis.ml b/src/Synthesis.ml
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+module T = Types
+module V = Values
+module E = Expressions
+module C = Contexts
+module Subst = Substitute
+module A = CfimAst
+module L = Logging
+open InterpreterUtils
+open InterpreterProjectors
+(* for symbolic_expansion definition *)
+
+(* TODO: the below functions have very "rough" signatures and do nothing: I
+ * defined them so that the places where we should update the synthesized
+ * program are clearly indicated in Interpreter.ml.
+ * Also, some of those functions will probably be split, and their call site
+ * will probably evolve.
+ *
+ * Small rk.: most functions should take an additional parameter for the
+ * fresh symbolic value which stores the result of the computation.
+ * For instance:
+ *   `synthesize_binary_op Add op1 op2 s`
+ * should generate:
+ *   `s := op1 + op2`
+ * *)
+
+(* TODO: error Panic *)
+
+(** Synthesize code for a symbolic expansion which doesn't lead to branching
+    (i.e., applied on a value which is not an enumeration with several variants).
+ *)
+let synthesize_symbolic_expansion_no_branching (_sv : V.symbolic_value)
+    (_see : symbolic_expansion) : unit =
+  ()
+
+(** Synthesize code for a symbolic enum expansion (which leads to branching)
+ *)
+let synthesize_symbolic_expansion_enum_branching (_sv : V.symbolic_value)
+    (_seel : symbolic_expansion list) : unit =
+  ()
+
+let synthesize_symbolic_expansion_if_branching (_sv : V.symbolic_value) : unit =
+  ()
+
+let synthesize_symbolic_expansion_switch_int_branching (_sv : V.symbolic_value)
+    : unit =
+  ()
+
+let synthesize_unary_op (_unop : E.unop) (_op : V.typed_value)
+    (_dest : V.symbolic_value) : unit =
+  ()
+
+let synthesize_binary_op (_binop : E.binop) (_op1 : V.typed_value)
+    (_op2 : V.typed_value) (_dest : V.symbolic_value) : unit =
+  ()
+
+(** Actually not sure if we need this, or a synthesize_symbolic_expansion_enum *)
+let synthesize_eval_rvalue_discriminant (_p : E.place) : unit = ()
+
+let synthesize_eval_rvalue_ref (_p : E.place) (_bkind : E.borrow_kind) : unit =
+  ()
+
+let synthesize_eval_rvalue_aggregate (_aggregate_kind : E.aggregate_kind)
+    (_ops : E.operand list) : unit =
+  ()
+
+let synthesize_function_call (_fid : A.fun_id)
+    (_region_params : T.erased_region list) (_type_params : T.ety list)
+    (_args : V.typed_value list) (_dest : E.place) (_res : V.symbolic_value) :
+    unit =
+  ()
+
+let synthesize_panic () : unit = ()
+
+let synthesize_assert (_v : V.typed_value) : unit = ()