[BUG] Passing functions which have arguments to other functions fails without type hints

[jackmott]

Bug description

Within def functions I expect to be able to pass function pointers around without type hints just as I would in python. If the functions have no arguments, this works fine. But passing a function that has arguments to another function currently fails, unless you add type hints.

Steps to reproduce

Here is a minimal reproducing example, the call to bar within main errors with: invalid call to 'bar': argument #0 cannot be converted from 'fn(owned s: object) raises -> object' to 'object'mojo

def foo(s):
    print(s)
     
def bar(foo):
    foo("foo")
    print("bar")
 
def main():
    bar(foo)

System information

- Windows with Ubuntu linux subsystem
- Mojo 24.3.0
- Modular 0.7.4