299645 - arguments entries are always aliased with parameters (corresponding properties of activation object)

Status: RESOLVED DUPLICATE of bug 292215

(Core :: JavaScript Engine, defect)

Description

[mozilla]

User-Agent:       Mozilla/5.0 (compatible; Konqueror/3.4; Linux) KHTML/3.4.0 (like Gecko)
Build Identifier: 

arguments[n] should alias to local parameter n *only* if the function has 
been called with k > n variables. 
Or in other words (from section 10.1.8 of ECMAscript spec): 
'In the case when arg is less than the number of formal parameters for the 
Function object, this property shares its value with the corresponding property 
of the activation object.' 

Reproducible: Always

Comment 1

[mozilla]

Attachment: test-case.

As f is called with k=1 parameters, arguments[1] should not alias with y.
Instead printing "3" (as it does in my version), "undefined" should be printed.

Comment 2

[Brendan Eich [:brendan]]

Thanks, this is already covered by bug 292215 -- nice simple testcase here, I
will make sure it works when fixing 292215.

/be

*** This bug has been marked as a duplicate of 292215 ***