for i in list {
looping
}
for i in ℤ[-1:1] {
};
for i in ℤ⁅-1:1:2⁆ if i > 0 {
};
for (k, v) in dict {
for (i, j) in list {
looping
}
}
for (k, mut v) in dict if k > 0 {
looping
}
for (k, mut v) in dict if k > 0 {
looping
}
else {
nothing
}