import std;

import std.conv : text;

​

​

void main()

{

    char[6] s;

    s = "abc";

    writeln(s, s.length);  // abc6, ok it's the static array's length

    string t = text("head-", s, "-tail");

    writeln(t, t.length);  // head-abc-tail16, why 16 instead of 13, t's type is string here

    assert(t[9] == '\0');

    assert(t == "head-abc-tail");

}