lib/standard: remove the only `attr-in-refinement` warning

Signed-off-by: Jean Privat <jean@pryen.org>

diff --git a/lib/standard/string.nit b/lib/standard/string.nit
index 61af948..6af3693 100644 (file)
--- a/lib/standard/string.nit
+++ b/lib/standard/string.nit
@@ -2452,7 +2452,7 @@ extern class NativeString `{ char* `}
 end
 
 redef class Sys
-       private var args_cache: nullable Sequence[String]
+       private var args_cache: nullable Sequence[String] = null
 
        # The arguments of the program as given by the OS
        fun program_args: Sequence[String]