808340 - Destructuring assignments can return confusing error messages

Status: RESOLVED WORKSFORME

(Core :: JavaScript Engine, defect)

Description

[Mike Ratcliffe [:miker] [:mratcliffe] [:mikeratcliffe]]

The following results in the error "values() is undefined":

function notvalues() {
  return [1, 2, 3];
}

let [x, y, z] = values();

This is to be expected but the following produces the same error even though values is defined:

function values() {
  return;
}

let [x, y, z] = values();
Maybe we could return something like "Unable to deconstruct return value."

Comment 1

[Tooru Fujisawa [:arai]]

> function notvalues() {
>   return [1, 2, 3];
> }
> 
> let [x, y, z] = values();

current error message is "ReferenceError: values is not defined",
on today's nightly.

> function values() {
>   return;
> }
> 
> let [x, y, z] = values();

and "TypeError: values(...) is undefined" for this.

I think they're clear enough now.

Comment 2

[André Bargull [:anba]]

Resolving as WFM per comment #1.