1340307 - Throw ReferenceError instead of SyntaxError when applying increment/decrement operator on invalid target

Status: RESOLVED INVALID

(Core :: JavaScript Engine, defect, P3)

Description

[André Bargull [:anba]]

js> ++0;
typein:1:2 SyntaxError: invalid increment/decrement operand:
typein:1:2 ++0;
typein:1:2 ..^


Expected: Throws ReferenceError
Actual: Throws SyntaxError

Comment 1

[André Bargull [:anba]]

This is required for test262 module tests. No, I'm not kidding...! :-/

Comment 2

[Jeff Walden [:Waldo]]

Making all of these early ReferenceError into early SyntaxError is an ECMA-262 change that's just waiting for someone to attempt it, to give feedback on whether it's possible.  Can you just disable the few affected tests for a short-term fix, and then one of us can super-immediately flip all the early ReferenceErrors to early SyntaxErrors so we're not sitting on that change any longer?

Comment 3

[André Bargull [:anba]]

(In reply to Jeff Walden [:Waldo] (remove +bmo to email) from comment #2)
> Can you just disable the few affected tests for a short-term fix, [...]

Sure, I can disable the affected tests.

Comment 5

[Ross Kirsling [:rkirsling]]

Good news! The spec change to abolish early ReferenceError reached consensus this morning in Berlin:
https://github.com/tc39/ecma262/pull/1527

Comment 6

[Tom S [:evilpie]]

See bug 1556818 for the one case 0 = 0 that needs to be fixed.