1863308 - Confusing error when using `case` as a variable name in for loop initializer

Status: RESOLVED FIXED

(Core :: JavaScript Engine, enhancement, P3)

Description

[Emilio Cobos Álvarez (:emilio)]

for (let case of ["removed", "changed"]) {}

Says:

Uncaught SyntaxError: missing ; after for-loop initializer

Which was very confusing until I realized case is a JS keyword.

V8 says:

Uncaught SyntaxError: Unexpected token 'case'

Which is a bit less confusing.

Comment 1

[Jonatan Klemets [:jon4t4n]]

Attachment: Bug 1863308 - Improve error message when using reserved word in `for (let ...)` r=arai

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/6d8cf3ece335
Improve error message when using reserved word in `for (let ...)` r=arai

Comment 3

[Narcis Beleuzu [:NarcisB]]

https://hg.mozilla.org/mozilla-central/rev/6d8cf3ece335