Are you sure that curly braces are used for map here? What syntax is needed to access the set element on line 17?

In Go, curly braces are used to create maps, but the syntax for accessing map elements is as follows:

value := myMap[key]

If it's about a set, Go does not have a built-in set type; it is usually implemented as a map with an empty struct as the value:

set := make(map[string]struct{})
set["element"] = struct{}{}

To check if an element exists in the set, the syntax is:

_, exists := set["element"]
if exists {
    // element is in the set
}

Thus, on line 17, to access an element in the set, you should use set[key] and check for existence using the second return value.