diff --git a/aeon/synthesis_grammar/grammar.py b/aeon/synthesis_grammar/grammar.py
index ff44e313..293dcbc9 100644
--- a/aeon/synthesis_grammar/grammar.py
+++ b/aeon/synthesis_grammar/grammar.py
@@ -336,7 +336,11 @@ def gen_grammar_nodes(
     Returns:
         list[type]: The list of generated grammar nodes.
     """
-    vars_to_ignore = metadata[synth_func_name]["syn_ignore"]
+    vars_to_ignore = (
+        metadata[synth_func_name]["syn_ignore"]
+        if synth_func_name in metadata and "syn_ignore" in metadata[synth_func_name].keys()
+        else []
+    )
     if grammar_nodes is None:
         grammar_nodes = []
     for var in ctx.vars():
diff --git a/tests/hole_test.py b/tests/hole_test.py
index e5179426..85971591 100644
--- a/tests/hole_test.py
+++ b/tests/hole_test.py
@@ -9,7 +9,7 @@
 def extract_target_functions(source):
     prog = parse_program(source)
     prog = apply_decorators_in_program(prog)
-    core, ctx, _ = desugar(prog)
+    core, ctx, _, _ = desugar(prog)
     core_anf = ensure_anf(core)
     check_type_errors(ctx, core_anf, top)
     return incomplete_functions_and_holes(ctx, core_anf)
diff --git a/tests/native_test.py b/tests/native_test.py
index c0dfa038..c5ca5467 100644
--- a/tests/native_test.py
+++ b/tests/native_test.py
@@ -8,7 +8,7 @@
 
 
 def check_compile(source, ty):
-    p, ctx, ectx = desugar(parse_program(source))
+    p, ctx, ectx, _ = desugar(parse_program(source))
     assert check_type(ctx, p, ty)
     assert eval(p, ectx) == 2
 
diff --git a/tests/optimization_decorators_test.py b/tests/optimization_decorators_test.py
index 3d0ef0f9..cdce3169 100644
--- a/tests/optimization_decorators_test.py
+++ b/tests/optimization_decorators_test.py
@@ -10,7 +10,7 @@
 
 def extract_core(source: str) -> Term:
     prog = parse_program(source)
-    core, ctx, _ = desugar(prog)
+    core, ctx, _, _ = desugar(prog)
     core_anf = ensure_anf(core)
     check_type_errors(ctx, core_anf, top)
     return core_anf
@@ -41,6 +41,7 @@ def main(args:Int) : Unit {
         core_ast,
         typing_ctx,
         evaluation_ctx,
+        metadata,
     ) = desugar(prog)
 
     core_ast_anf = ensure_anf(core_ast)
diff --git a/tests/pow_test.py b/tests/pow_test.py
index a967f59e..3732c657 100644
--- a/tests/pow_test.py
+++ b/tests/pow_test.py
@@ -7,7 +7,7 @@
 
 
 def check_compile(source, ty):
-    p, ctx, _ = desugar(parse_program(source))
+    p, ctx, _, _ = desugar(parse_program(source))
     assert check_type(ctx, p, ty)
 
 
diff --git a/tests/recursion_test.py b/tests/recursion_test.py
index fbc395b1..88553952 100644
--- a/tests/recursion_test.py
+++ b/tests/recursion_test.py
@@ -7,7 +7,7 @@
 
 
 def check_compile(source, ty, res):
-    p, ctx, ectx = desugar(parse_program(source))
+    p, ctx, ectx, _ = desugar(parse_program(source))
     assert check_type(ctx, p, ty)
     # assert eval(p, ectx) == res
 
diff --git a/tests/smt_test.py b/tests/smt_test.py
index 6fd671c4..05006ea7 100644
--- a/tests/smt_test.py
+++ b/tests/smt_test.py
@@ -20,7 +20,7 @@
 
 def extract_core(source: str) -> Term:
     prog = parse_program(source)
-    core, ctx, _ = desugar(prog)
+    core, ctx, _, _ = desugar(prog)
     core_anf = ensure_anf(core)
     check_type_errors(ctx, core_anf, top)
     return core_anf
@@ -30,8 +30,7 @@ def extract_core(source: str) -> Term:
     "x",
     t_int,
     LiquidApp("==", [LiquidVar("x"), LiquidLiteralInt(3)]),
-    LiquidConstraint(LiquidApp(
-        "==", [LiquidVar("x"), LiquidLiteralInt(3)])),
+    LiquidConstraint(LiquidApp("==", [LiquidVar("x"), LiquidLiteralInt(3)])),
 )
 
 
@@ -47,8 +46,7 @@ def test_smt_example3():
         "y",
         BaseType("a"),
         LiquidApp("==", [LiquidVar("x"), LiquidVar("y")]),
-        LiquidConstraint(LiquidApp(
-            "==", [LiquidVar("x"), LiquidVar("y")])),
+        LiquidConstraint(LiquidApp("==", [LiquidVar("x"), LiquidVar("y")])),
     ),
 )
 
@@ -80,6 +78,7 @@ def main (x:Int) : Unit {
         core_ast,
         typing_ctx,
         evaluation_ctx,
+        metadata,
     ) = desugar(prog)
 
     core_ast_anf = ensure_anf(core_ast)
@@ -104,6 +103,7 @@ def main (x:Int) : Unit {
         core_ast,
         typing_ctx,
         evaluation_ctx,
+        metadata,
     ) = desugar(prog)
 
     core_ast_anf = ensure_anf(core_ast)
diff --git a/tests/synth_fitness_test.py b/tests/synth_fitness_test.py
index 6c136d50..6bf1bbbd 100644
--- a/tests/synth_fitness_test.py
+++ b/tests/synth_fitness_test.py
@@ -36,10 +36,10 @@ def synth (i: Int): Int { (?hole: Int) * i}
         def __internal__fitness_function_synth : Int  =  year - synth(7);
     """
     prog = parse_program(code)
-    p, ctx, ectx = desugar(prog)
+    p, ctx, ectx, _ = desugar(prog)
     p = ensure_anf(p)
     check_type_errors(ctx, p, top)
-    term = synthesize(ctx, ectx, p, [("synth", ["hole"])])
+    term = synthesize(ctx, ectx, p, [("synth", ["hole"])], {})
 
     assert isinstance(term, Term)
 
@@ -50,9 +50,9 @@ def test_fitness2():
             def synth (i:Int) : Int {(?hole: Int) * i}
         """
     prog = parse_program(code)
-    p, ctx, ectx = desugar(prog)
+    p, ctx, ectx, _ = desugar(prog)
     p = ensure_anf(p)
     check_type_errors(ctx, p, top)
-    term = synthesize(ctx, ectx, p, [("synth", ["hole"])])
+    term = synthesize(ctx, ectx, p, [("synth", ["hole"])], {})
 
     assert isinstance(term, Term)