t/harness: Clarify error message wording

diff --git a/t/harness b/t/harness
index b9857fa..58a212f 100644 (file)
--- a/t/harness
+++ b/t/harness
@@ -195,8 +195,8 @@ if (@ARGV) {
 
         my @nonexistent_serials = grep { not exists $all_dirs{$_} } keys %serials;
         if (@nonexistent_serials) {
-            die "These directories to be run serially are incorrectly"
-              . " specified:\n" . join "\n", @nonexistent_serials;
+            die "These directories to be run serially don't exist."
+              . "  Check your spelling:\n" . join "\n", @nonexistent_serials;
         }
 
         # Remove the serial testing directories from the list of all