Issue #25923: Added more const qualifiers to signatures of static and private functions.
diff --git a/Modules/main.c b/Modules/main.c
index 4358cc8..35d07fd 100644
--- a/Modules/main.c
+++ b/Modules/main.c
@@ -103,7 +103,7 @@
 ";
 
 static int
-usage(int exitcode, wchar_t* program)
+usage(int exitcode, const wchar_t* program)
 {
     FILE *f = exitcode ? stderr : stdout;