type MyArray = []string
type MyString = string
type MyFloat = f64
type MyMap = map[string]string

struct Foo {
    a string
    b ?string
    c MyArray
    d MyString
    e MyFloat
    f MyMap
}

fn test_main() {
    mut out := map[string][]string{}
    $for field in Foo.fields {
        out[field.name] = []string{}
        print('${field.name} is ')
        $if field.unaliased_typ is $int {
            println('numeric')
            out[field.name] << 'numeric'
        } $else $if field.unaliased_typ is $array {
            println('array')
            out[field.name] << 'array'
        } $else $if field.unaliased_typ is $float {
            println('float')
            out[field.name] << 'float'
        } $else $if field.unaliased_typ is $map {
            println('map')
            out[field.name] << 'map'
        } $else $if field.unaliased_typ is string || field.unaliased_typ is ?string {
            println('string opt? ${field.is_option}')
            out[field.name] << 'string'
        } $else {
            assert false
        }
    }
    assert out['a'][0] == 'string'
    assert out['b'][0] == 'string'
    assert out['c'][0] == 'array'
    assert out['d'][0] == 'string'
    assert out['e'][0] == 'float'
    assert out['f'][0] == 'map'
}