Cannot override built-in functions in scripts

[ooper-zz]

the following script works in HC 2.4, but breaks in WyldCard:

WyldCard is breaking during script parsing when overriding a built-in function. However, HyperCard lets it through, allowing you to override the function, and executes it if the function is "passed" (eg. pass menuItems). This is true for other built-in functions, like time().

Shouldn't WyldCard behave the same way?