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

["S. Gilles" <sgilles@xxxxxxx>]

---
This should be the last for this series, it's been put through light
local use without any other fires.

 lib/std/fmt.myr | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/std/fmt.myr b/lib/std/fmt.myr
index 41785244..4a70c210 100644
--- a/lib/std/fmt.myr
+++ b/lib/std/fmt.myr
@@ -593,6 +593,10 @@ const getint = {s, msg
 }
 
 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)
-- 
2.24.0