From ea5ba705281aa5a5984fbebac4b29dcb9da752e0 Mon Sep 17 00:00:00 2001
From: dimgigov <gigov@gigov.org>
Date: Tue, 28 Jul 2026 21:17:21 +0300
Subject: [PATCH] =?UTF-8?q?fix(selfhost-lower):=20null-guard=20Lcx=5FSubst?=
 =?UTF-8?q?EnumName=20=E2=80=94=20hStore=20nodes=20with=20null=20typeName?=
 =?UTF-8?q?=20segfaulted=20buxc2=20project=20(bux=5Fstrlen(NULL)=20via=20S?=
 =?UTF-8?q?tring=5FLen)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/hir_lower.bux | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/hir_lower.bux b/src/hir_lower.bux
index 7cc205b..231d2ab 100644
--- a/src/hir_lower.bux
+++ b/src/hir_lower.bux
@@ -682,6 +682,9 @@ module HirLower {
     }
 
     func Lcx_SubstEnumName(ctx: *LowerCtx, name: String) -> String {
+        // HIR nodes may carry null names (e.g. hStore without typeName);
+        // Nim tolerated nil strings, bux_strlen(NULL) segfaults.
+        if name == null as String { return name; }
         // If name is a bare generic enum name, mangle to concrete name
         var ge: *Decl = Lcx_FindGenericEnum(ctx, name);
         if ge != null as *Decl {