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@resultBuilder
struct ArrayBuilder {
main.swift:19:46: warning: string interpolation produces a debug description for an optional value; did you mean to make this explicit?
print("\(index)] build optional : \(component) -> \(result)")
^~~~~~~~~
main.swift:19:46: note: use 'String(describing:)' to silence this warning
print("\(index)] build optional : \(component) -> \(result)")
^~~~~~~~~
String(describing: )
main.swift:19:46: note: provide a default value to avoid this warning
print("\(index)] build optional : \(component) -> \(result)")
^~~~~~~~~
?? <#default value#>
Please Wait...
1] build expression: 5 -> [5]
hi
2] build expression: 10 -> [10]
3] build block : [[10]] -> [10]
[10]
[5]
4] build expression: 22 -> [22]
5] build block : [[22]] -> [22]
6] build 2nd : [22] -> [22]
7] build block : [[22]] -> [22]
[22]
level: 1, 2nd
level: 2, 2nd
level: 3, 1st
8] build expression: 33 -> [33]
9] build block : [[33]] -> [33]
10] build 1st : [33] -> [33]
11] build block : [[33]] -> [33]
12] build 2nd : [33] -> [33]
13] build block : [[33]] -> [33]
14] build 2nd : [33] -> [33]
15] build block : [[33]] -> [33]
[33]
level: 3, 1st
16] build expression: 43 -> [43]
17] build block : [[43]] -> [43]
18] build 1st : [43] -> [43]
19] build 2nd : [43] -> [43]
20] build block : [[43]] -> [43]
[43]
21] build expression: 51 -> [51]
22] build block : [[51]] -> [51]
23] build optional : Optional([51]) -> [51]
24] build block : [[51]] -> [51]
[51]
