Can't iterate over an enum, map or zip in a functional for

[EmilyBourne]

Describe the bug

Can't iterate over an enum, map or zip in a functional for

To Reproduce

Provide code to reproduce the behavior:

@types('int[:]')
def functional_for_1d_enum(y):
    a = [i*yi for i,yi in enumerate(y)]
    return len(a), a[0], a[1], a[2], a[3]

Error details

Provide the generated code, or the error message:

RuntimeError: (i, yi) does not exist in scope

[EmilyBourne]

Duplicate of #1399