From 35a32d41e03ad10134d7705e4e502c1a23f39d47 Mon Sep 17 00:00:00 2001
From: gingerBill <gingerBill@users.noreply.github.com>
Date: Sun, 28 Sep 2025 21:08:47 +0100
Subject: Fix `Union{}`

---
 src/llvm_backend_const.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/llvm_backend_const.cpp b/src/llvm_backend_const.cpp
index d3e2826ed..9563e4800 100644
--- a/src/llvm_backend_const.cpp
+++ b/src/llvm_backend_const.cpp
@@ -885,6 +885,16 @@ gb_internal lbValue lb_const_value(lbModule *m, Type *type, ExactValue value, lb
 
 			i64 block_size = bt->Union.variant_block_size;
 
+			if (are_types_identical(value_type, original_type)) {
+				if (value.kind == ExactValue_Compound) {
+					ast_node(cl, CompoundLit, value.value_compound);
+					GB_ASSERT(cl->elems.count == 0);
+					return lb_const_nil(m, original_type);
+				}
+
+				GB_PANIC("%s vs %s", type_to_string(value_type), type_to_string(original_type));
+			}
+
 			lbValue cv = lb_const_value(m, value_type, value, cc, value_type);
 			Type *variant_type = cv.type;
 
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