From 7185a93a8631060958565d6e3fba03b4b6eeccce Mon Sep 17 00:00:00 2001
From: Laytan Laats <laytanlaats@hotmail.com>
Date: Wed, 8 Jan 2025 20:22:59 +0100
Subject: [PATCH] actually fix #no_nil debug info

Fixes #4664
---
 src/llvm_backend_debug.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/llvm_backend_debug.cpp b/src/llvm_backend_debug.cpp
index 3951fc977..6740cd1a2 100644
--- a/src/llvm_backend_debug.cpp
+++ b/src/llvm_backend_debug.cpp
@@ -438,8 +438,13 @@ gb_internal LLVMMetadataRef lb_debug_union(lbModule *m, Type *type, String name,
 	for_array(j, bt->Union.variants) {
 		Type *variant = bt->Union.variants[j];
 
+		ptrdiff_t variant_index = j;
+		if (bt->Union.kind == UnionType_no_nil) {
+			variant_index += 1;
+		}
+
 		char name[32] = {};
-		gb_snprintf(name, gb_size_of(name), "v%td", j);
+		gb_snprintf(name, gb_size_of(name), "v%td", variant_index);
 		isize name_len = gb_strlen(name);
 
 		elements[index_offset+j] = LLVMDIBuilderCreateMemberType(