From 18c61d86dc3b7673d905ea567676d0fed4409f75 Mon Sep 17 00:00:00 2001
From: Jacob Signorovitch <jacob.signorovitch@gmail.com>
Date: Tue, 11 Mar 2025 17:56:04 +0900
Subject: [PATCH] Fixed crash on unknown var name.

---
 src/exec.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/exec.c b/src/exec.c
index ce3604f..9f16165 100644
--- a/src/exec.c
+++ b/src/exec.c
@@ -114,7 +114,19 @@ AST* exec_vref(AST* ast) {
     log_dbg("attempting to reference var");
     ASTVrefData* vref = (ASTVrefData*)ast->data;
 
-    return exec_exp(exec_find(vref->to));
+    AST* found = exec_find(vref->to);
+
+    if (found == NULL) {
+        // TODO: Better memory management here.
+        static char msg[256];
+        snprintf(
+            msg, sizeof(msg), "Could not find value in scope for `%s`.",
+            vref->to
+        );
+        return ast_init(AST_TYPE_EXC, msg);
+    }
+
+    return exec_exp(found);
 }
 
 void exec_print(double n) { printf("= %lf\n", n); }