Error handling, compile error about v HOT 2 OPEN

Thanks for the issue.

I think that the compiler should not have allowed fn (item json2.Any) !string to be used as an argument of .map(), since a result value has to be handled right away, not stored in an array.
It should have been a checker error, instead of a cgen one.

A fixed version of the code above may look like this:

import x.json2
fn main() {
    json_str := '{"data": [{"name":"bob"}, {"name":"tom"}]}'
    decoded := json2.raw_decode(json_str) or {
        eprintln('Failed to decode JSON: $err')
        return
    }
    data_arr := decoded.as_map()['data']!.arr()
    names := data_arr.map(fn (item json2.Any) string {
        return item.as_map()['name'] or {''}.str()
    })
    println(names)
}

from v.

i think it should require ! on map() result if callback returns Result's, otherwise everyone will make their maybe_map/``maybe_map_map` functions

from v.