--- nono/vm/test_tool.h	2026/04/29 17:05:11	1.1.1.2
+++ nono/vm/test_tool.h	2026/04/29 17:05:43	1.1.1.3
@@ -35,7 +35,7 @@
 class autotemp
 {
  public:
-	autotemp(const std::string& name) {
+	explicit autotemp(const std::string& name) {
 		strcpy(tempname, "/tmp/sayakatest.XXXXXX");
 		cdirname = mkdtemp(tempname);
 		filename = std::string(cdirname) + "/" + name;