337540 - x=setTimeout('...',delay); produces JavaScript errot but no error when x=setTimeout('...',delay);var delay;

Status: RESOLVED INVALID

(Core :: JavaScript Engine, defect)

Description

[WADA:World Anti-bad-Duping Agency]

This is sub issue of Bug 332759 Comment #26.

x=setTimeout('...',delay) produces JavaScript errot(delay is not defined), but no error when x=setTimeout('...',delay);var delay;

If "var delay;" is coded after setTimeout call, window.delay is defined before setTimeout call execution.
It's same result as var dealy;x=setTimeout('...',delay); case.
This indicates that "var dealy;" is detected and window.delay is created at compile stage. 
I think that existence of window.delay for global variable of "delay" is the reason why JavaScript error is not generated when "x=setTimeout('...',delay);var delay;"

Is this as designed? Defined action by ECMA Script? JavaScript 1.x extention?

Comment 1

[Bob Clary [:bc] (inactive)]

The variable is created when the execution scope is entered, not when the statement is executed. See <http://bclary.com/2004/11/07/#a-12.2>, <http://bclary.com/2004/11/07/#a-10.1.3>. 

Comment 2

[WADA:World Anti-bad-Duping Agency]

(In reply to comment #1)
> The variable is created when the execution scope is entered, not when the
> statement is executed.

<http://bclary.com/2004/11/07/#a-10.1.3> clearly says: 
> 10.1.3 Variable Instantiation
>(snip)
> * For each VariableDeclaration or VariableDeclarationNoIn in the code,
>   create a property of the variable object whose name is the Identifier
>   in the VariableDeclaration or VariableDeclarationNoIn, whose value is
>   undefined and whose attributes are determined by the type of code.

I knew about FunctionDeclaration but didn't about VariableDeclaration.
Thanks for quick answer. (Forgive my mis-use of Bugzilla for Q&A, please.)  
Closing as INVALID.