いや凄く変で面白いっすよまじで
配列の内容のコピー
int[3] s;
int[3] t;
s[] = t;the 3 elements of t[3] are copied into s[3]
s[] = t[];the 3 elements of t[3] are copied into s[3]
s[1..2] = t[0..1];same as s[1] = t[0]
s[0..2] = t[1..3];same as s[0] = t[1], s[1] = t[2]
..の前のはじまりのインデックスは0ベースで
..の後の終わりは1ベースなのなんだろ