Name the node every refusal came from, and close the error list

src/result.ts

@@ -18,15 +18,18 @@ export type ConvertErrorCode =
   | 'unsupported-node-shape'
   | 'unsupported-node-type'
 
+export type ConvertErrorPath = readonly (number | string)[]
+
 export type ConvertError = {
   code: ConvertErrorCode
   message: string
+  path: ConvertErrorPath
 }
 
 export type Result<T> = { error: ConvertError; ok: false } | { ok: true; value: T }
 
-export function failure<T>(code: ConvertErrorCode, message: string): Result<T> {
-  return { error: { code, message }, ok: false }
+export function failure<T>(code: ConvertErrorCode, message: string, path: ConvertErrorPath): Result<T> {
+  return { error: { code, message, path }, ok: false }
 }
 
 export function success<T>(value: T): Result<T> {