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[PATCH v2 4/3] Somewhat better error for std.put("{w=?}", "foo")

--- a/lib/std/fmt.myr

+++ b/lib/std/fmt.myr

@@ -593,6 +593,10 @@

 }

 const pullint = {ap, msg

+	if ap.tc.nelt < 1

+		die("expected argument where none was provided")

+	;;

+

 	match typedesc(vatype(ap))

 	| `Tyint8:

 		var val : int8 = vanext(ap)