For test runner, try to look for os.exit or os2.exit

src/checker.cpp

@@ -923,6 +923,22 @@ gb_internal AstPackage *get_core_package(CheckerInfo *info, String name) {
 	return *found;
 }
 
+
+gb_internal AstPackage *try_get_core_package(CheckerInfo *info, String name) {
+	if (name == "runtime") {
+		return get_runtime_package(info);
+	}
+
+	gbAllocator a = heap_allocator();
+	String path = get_fullpath_core_collection(a, name, nullptr);
+	defer (gb_free(a, path.text));
+	auto found = string_map_get(&info->packages, path);
+	if (found == nullptr) {
+		return nullptr;
+	}
+	return *found;
+}
+
 gb_internal void add_package_dependency(CheckerContext *c, char const *package_name, char const *name, bool required=false) {
 	String n = make_string_c(name);
 	AstPackage *p = get_core_package(&c->checker->info, make_string_c(package_name));

src/llvm_backend.cpp

@@ -2900,7 +2900,24 @@ gb_internal lbProcedure *lb_create_main_procedure(lbModule *m, lbProcedure *star
 		args[0] = lb_addr_load(p, all_tests_slice);
 		lbValue result = lb_emit_call(p, runner, args);
 
-		lbValue exit_runner = lb_find_package_value(m, str_lit("os"), str_lit("exit"));
+		lbValue exit_runner = {};
+		{
+			AstPackage *pkg = try_get_core_package(m->info, str_lit("os"));
+			if (pkg == nullptr) {
+				pkg = try_get_core_package(m->info, str_lit("os2"));
+			}
+			if (pkg == nullptr) {
+				pkg = get_core_package(m->info, str_lit("os2"));
+			}
+
+			String name = str_lit("exit");
+			Entity *e = scope_lookup_current(pkg->scope, name);
+			if (e == nullptr) {
+				compiler_error("Could not find type declaration for '%.*s.%.*s'\n", LIT(pkg->name), LIT(name));
+			}
+			exit_runner = lb_find_value_from_entity(m, e);
+		}
+
 		auto exit_args = array_make<lbValue>(temporary_allocator(), 1);
 		exit_args[0] = lb_emit_select(p, result, lb_const_int(m, t_int, 0), lb_const_int(m, t_int, 1));
 		lb_emit_call(p, exit_runner, exit_args, ProcInlining_none);