From 0bedd3357ae709c1d35e86ce6e883964fea13fdd Mon Sep 17 00:00:00 2001
From: gingerBill <bill@gingerbill.org>
Date: Sun, 4 Aug 2024 14:58:12 +0100
Subject: [PATCH] Disallow `err != 0` with `os.Error` when `-strict-style` is
 enabled

---
 src/check_expr.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/check_expr.cpp b/src/check_expr.cpp
index 06784a7f3..b291cbe70 100644
--- a/src/check_expr.cpp
+++ b/src/check_expr.cpp
@@ -4461,7 +4461,8 @@ gb_internal void convert_to_typed(CheckerContext *c, Operand *operand, Type *tar
 	case Type_Union:
 		// IMPORTANT NOTE HACK(bill): This is just to allow for comparisons against `0` with the `os.Error` type
 		// as a kind of transition period
-		if (operand->mode == Addressing_Constant &&
+		if (!build_context.strict_style &&
+		    operand->mode == Addressing_Constant &&
 		    target_type->kind == Type_Named &&
 		    (c->pkg == nullptr || c->pkg->name != "os") &&
 		    target_type->Named.name == "Error") {