[BUG] Using a default value for a List of functions attribute of a struct leads to an OOB error upon access.

Bug description

Given a Struct like

struct A():
    var funcs: List[fn() -> None]

Specifying a default argument value for funcs in the __init__() function signature leads to an OOB error when attempting to access the functions.

Steps to reproduce

Example

fn test() -> None:
    return None


struct Dummy():
    var funcs: List[fn() -> None]

    fn __init__(inout self, funcs: List[fn() -> None] = List[fn() -> None](test)):
        self.funcs = funcs

fn main() raises:
    var d = Dummy()
    for func in d.funcs:
        func[]()

System information

- What OS did you do install Mojo on ? MacOS 14.5
- Provide version information for Mojo by pasting the output of `mojo -v` mojo 2024.7.2205 (9b0e6242)
- Provide Modular CLI version by pasting the output of `modular -v` modular 0.7.1 (28ddab26)

Start by running the supplied Mojo reproduction with the shown Dummy struct, default List value, and main entry point. Compare access to d.funcs when using Dummy() with the behavior when the list is passed explicitly. Done means the default-valued List of functions can be iterated and its functions invoked without an out-of-bounds error.