From 049771d914adbc998dcdd143bd53d07344a63f7f Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Mon, 01 Sep 2014 14:50:22 -0400
Subject: set_substvar(): Warn, don't error, on bad name

---
diff --git a/lib/substvars.sh b/lib/substvars.sh
index 5ef662b..d69c693 100644
--- a/lib/substvars.sh
+++ b/lib/substvars.sh
@@ -32,7 +32,8 @@ set_substvar()
 	name="$(printf '%s\n' "${name}" | tr 'A-Z-' 'a-z_')"
 	case "${name:- }" in
 		*[!a-z0-9_]*)
-			error 2 "$(get_msg 'substvar_invalid')" "${name}"
+			warn "$(get_msg 'substvar_invalid')" "${name}"
+			return 1
 			;;
 	esac
 
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