Report the canonical node path in load errors

reference.go

@@ -90,9 +90,14 @@ func contained(n node) []namedNode {
 	}
 }
 
+// named skips a bound {..path} key: it is a render edge, not containment, so using
+// it as a path segment would report a node under a path that does not reach it.
 func named(m map[string]node) []namedNode {
 	out := make([]namedNode, 0, len(m))
 	for _, name := range sortedNames(m) {
+		if isRef(name) {
+			continue
+		}
 		out = append(out, namedNode{name: name, node: m[name]})
 	}
 	return out