611374 - Enhance "redeclaration of var" error messages to include the location of the original declaration

Status: RESOLVED DUPLICATE of bug 104442

(Core :: JavaScript Engine, enhancement)

Description

[Brian Crowder]

Basically, an error like this would be greatly improved by the addition of further hinting:

===snip===
error: An exception occurred.
Traceback (most recent call last):
  File "resource://jid0-wsgvcdpnsgacsdv18b9ssbjpwvo-jetpack-core-lib/plain-text-console.js", line 37, in 
    const {Cc,Ci} = require("chrome");
TypeError: redeclaration of var Cc
===snip===

ala gcc, something like

===snip===
File "resource://foo/blah.js", line 15" is the location of the previous declaration
===snip===

Comment 1

[Brian Crowder]

This might depend on help from bug 422501, but see also bug 443726 for confusion and mayhem.