From bce87d128b12261a37b048c5445d6962d852d7a1 Mon Sep 17 00:00:00 2001
From: tserg <8017125+tserg@users.noreply.github.com>
Date: Tue, 26 Dec 2023 17:15:08 +0800
Subject: [PATCH] use throwing in prefold

---
 vyper/semantics/analysis/pre_typecheck.py | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/vyper/semantics/analysis/pre_typecheck.py b/vyper/semantics/analysis/pre_typecheck.py
index aa71113e7d..223407d839 100644
--- a/vyper/semantics/analysis/pre_typecheck.py
+++ b/vyper/semantics/analysis/pre_typecheck.py
@@ -21,14 +21,16 @@ def get_constants(node: vy_ast.Module) -> dict:
             for n in c.value.get_descendants(include_self=True, reverse=True):
                 prefold(n, constants)
 
-            val = c.value.get_folded_value_maybe()
+            try:
+                val = c.value.get_folded_value_throwing()
 
-            # note that if a constant is redefined, its value will be overwritten,
-            # but it is okay because the syntax error is handled downstream
-            if val is not None:
+                # note that if a constant is redefined, its value will be overwritten,
+                # but it is okay because the syntax error is handled downstream
                 constants[name] = val
                 derived_nodes += 1
                 const_var_decls.remove(c)
+            except UnfoldableNode:
+                pass
 
         if not derived_nodes:
             break