`ensure_import_from` fails when top level module is imported

[vlopezferrando]

The pattern ensure_import_from($source) , when matched with a $name should add from $source import $name.

Using this simple pattern, we can test it:

engine marzano(0.1)
language python

`$_` where {
    $import = "prod",
    $import <: ensure_import_from(source = `math`),
}

There are different scenarios for which its behavior is correct:

1. There is no import from $source, so the import is added
2. There are other imports from $source, so $name is added
3. The import is already present, so nothing is done

But when there is a top level import $source, there is an error with the message:

Log: Trying to match against unbound variable $imports