tpl/resources: Improve resources.Concat error message

Closes #7428

diff --git a/tpl/resources/resources.go b/tpl/resources/resources.go
index 78340b1ff2b99a064f9400919d8e21c91b1f0209..5c2068b68f5c21dc540e61fa339edec1275a0bcd 100644 (file)
--- a/tpl/resources/resources.go
+++ b/tpl/resources/resources.go
@@ -224,7 +224,7 @@ func (ns *Namespace) Concat(targetPathIn any, r any) (resource.Resource, error)
        case resource.ResourcesConverter:
                rr = v.ToResources()
        default:
-               return nil, fmt.Errorf("slice %T not supported in concat", r)
+               return nil, fmt.Errorf("expected slice of Resource objects, received %T instead", r)
        }
 
        if len(rr) == 0 {