Bug 148098

Summary: We need a better error message for the use let/const/class in a Statement and not a StatementListItem
Product: WebKit Reporter: Saam Barati <saam>
Component: JavaScriptCoreAssignee: Nobody <webkit-unassigned>
Status: RESOLVED DUPLICATE    
Severity: Normal CC: basile_clement, bburg, benjamin, fpizlo, ggaren, littledan, mark.lam, mmirman, msaboff, oliver, ticaiolima, ysuzuki
Priority: P2    
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   

Description Saam Barati 2015-08-17 15:08:16 PDT 
i.e,
if (c)
   let/const/class F;

while (c)
   let/const/class F;

should have a better syntax error message.
Comment 1 Daniel Ehrenberg 2017-02-17 00:44:37 PST 
Whenever you're editing this code, there's a case in this area that I believe should be allowed, but seems to throw a syntax error:

```
if (true) let: x()
```

or

```
with ({}) let: y()
```

When I run that in JSC, I get

SyntaxError: Unexpected token ':'. Parse error.

whereas in V8, ChakraCore and SpiderMonkey, let is permitted as a label.
Comment 2 Caio Lima 2017-02-21 15:52:19 PST 
(In reply to comment #1)
> Whenever you're editing this code, there's a case in this area that I
> believe should be allowed, but seems to throw a syntax error:
> 
> ```
> if (true) let: x()
> ```
> 
> or
> 
> ```
> with ({}) let: y()
> ```
> 
> When I run that in JSC, I get
> 
> SyntaxError: Unexpected token ':'. Parse error.
> 
> whereas in V8, ChakraCore and SpiderMonkey, let is permitted as a label.

Daniel, we are solving this bug in https://bugs.webkit.org/show_bug.cgi?id=168684

Thank you for your report.
Comment 3 Yusuke Suzuki 2017-06-03 04:55:33 PDT 

*** This bug has been marked as a duplicate of bug 168684 ***