From 38841dd46e6bb5879200c0a8e2f879c8cfa005d6 Mon Sep 17 00:00:00 2001
From: gingerBill <bill@gingerbill.org>
Date: Thu, 19 Aug 2021 17:38:18 +0100
Subject: Fix race condition from `add_entity_use` due to Entity.identifier

---
 src/checker.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

(limited to 'src/checker.cpp')

diff --git a/src/checker.cpp b/src/checker.cpp
index 4ae5f5b1c..cd023998c 100644
--- a/src/checker.cpp
+++ b/src/checker.cpp
@@ -1297,9 +1297,9 @@ void add_entity_use(CheckerContext *c, Ast *identifier, Entity *entity) {
 		if (identifier->kind != Ast_Ident) {
 			return;
 		}
-		if (entity->identifier == nullptr) {
-			entity->identifier = identifier;
-		}
+		Ast *empty_ident = nullptr;
+		entity->identifier.compare_exchange_strong(empty_ident, identifier);
+
 		identifier->Ident.entity = entity;
 
 		if (c->info->allow_identifier_uses) {
-- 
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