Code shared from run.dlang.io.

main.d

void main()
{
    import std.stdio: write, writeln, writef, writefln;
    int[3] s;
    int[3] t;
    
    s = t;             // the 3 elements of t are copied into s
    s[] = t;           // the 3 elements of t are copied into s
    s[] = t[];         // the 3 elements of t are copied into s
    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]
}