Mojo does not allow dynamic value in default argument

[ivellapillil]

The following code works in python, but not in mojo:

def main():
    
    for i in range(5):
        def afn(x, i = i):
            print(i)
        

I get:

error: cannot use a dynamic value in default argument
        def afn(x, i = i):

Is this "incompatibility" going to stay? IIRC, it is somewhat common idiom in Python to overcome lazy evaluation...

[rarebreed]

This limitation is described in the rough edges section of the documentation (first bullet point in the small independent features).

It is in Modular's plans to make Mojo eventually compatible with python. But mojo is very young, so I think it will take quite some time to get there. I hope Modular will open source it once they have a good solid foundation to build on, and the community can help mojo become a superset of python faster.

[lattner]

Closing this just because it is tracked in rough edges already, we definitely need to support this in time