Answer architecture round 2: refuse a self-read only inside what the binding lands on, fix the struct.go Layout line, move loneRef beside its caller, and widen item 83 to the link passes

reference.go

@@ -251,11 +251,3 @@ func refTokens(toks []formatToken) []string {
 	}
 	return refs
 }
-
-// loneRef is the reference a format of one reference token and nothing else reads.
-func loneRef(toks []formatToken) (string, bool) {
-	if len(toks) != 1 || toks[0].kind != nameRead || len(toks[0].names) != 1 || !isRef(toks[0].names[0]) {
-		return "", false
-	}
-	return toks[0].names[0], true
-}