Bug 14090 – Redeclaring function throws syntax error

• Status: RESOLVED
• Resolution: DUPLICATE
• Component: JavaScriptCore

[Brad Fults]

Using http://mochikit.com/examples/interpreter/ as a simple CLI.

In r22084 nightly:

>>> for (var i=10;i>=0;i--) function x(k) { return ++k; };
Error:
line	1
message	Parse error
name	SyntaxError

In Firefox 2.0.0.4:

>>> for (var i=10;i>=0;i--) function x(k) { return ++k; };

[no error]

In Opera 9.21:

>>> for (var i=10;i>=0;i--) function x(k) { return ++k; };

[no error]

Similar results can be found in IE.

[Mark Rowe (bdash)]

This appears to be due to the lack of {}'s inside the for statement.  The following example throws a syntax error:

for (var i = 10; i >= 0; i--)
    function x(k)
    {
        return ++k;
    };


The following example does not:

for (var i = 10; i >= 0; i--)
{
    function x(k)
    {
        return ++k;
    };
}

[Cameron Zwarich (cpst)]

This is invalid syntax, according to the grammar in the ECMA spec. The body of a for loop is a Statement, and a FunctionDeclaration is not a Statement. Unless this is actually a compatibility issue, we should probably close this bug.

[Alexey Proskuryakov]

Per the bug description, this sounds like a compatibility issue.

[Cameron Zwarich (cpst)]

*** This bug has been marked as a duplicate of 13790 ***