Error: none of the overloads of template `once.main.each!((l)

[Joel via Digitalmars-d-learn]

What am I missing?

```d
import std;
void main() {
    struct DateRem {
        Date date;
        string rem;
        string toString() const => text(date.toSimpleString, " ", 
rem);
    }
    DateRem[] daterem;
    data
        .splitter('\n')
        .filter!(l => l.length && l[0].isDigit)
        .each!((l) {
            auto parts=l
                        .splitter[0..3]
                        .to!(int[]);
            if (parts.length==3) {
                daterem~=DateRem(Date(parts[2],parts[1],parts[0]),
                            l.splitter[3..$].join(" "));
                }
        });
        daterem.each!writeln;
}

auto data="04 10 2023 17:28, not much
30 9 2023 21:08, very little";
```