add nihil.std

1 files changed, 4 insertions, 12 deletions

diff --git a/nihil.cli/usage_error.ccm b/nihil.cli/usage_error.ccm
index 61feba7..7de178e 100644
--- a/nihil.cli/usage_error.ccm
+++ b/nihil.cli/usage_error.ccm
@@ -1,22 +1,14 @@
-/*
- * This source code is released into the public domain.
- */
-
-module;
-
-#include <string>
-
+// This source code is released into the public domain.
 export module nihil.cli:usage_error;
 
+import nihil.std;
 import nihil.error;
 
 namespace nihil {
 
-/*
- * Exception thrown to indicate invalid command-line arguments.
- */
+// Exception thrown to indicate invalid command-line arguments.
 export struct usage_error : error {
-	usage_error(std::string_view what) : error(what) {}
+	explicit usage_error(std::string_view what) : error(what) {}
 };
 
 } // namespace nihil