Distance and temperature with scalar units

// Requires the updated native Aner development runtime with aner.units.
import aner.units

let room: Point<degC> = 20.0@degC
let warmer = room + 5.0@delta_K
let rise: Quantity<delta_degC> = warmer - room
let distance = 2.0@m + 50.0@cm
let elapsed = 5.0@s
let speed: Quantity<"m/s"> = distance / elapsed

print(room)
print(room.to("K"))
print(warmer)
print(rise)
print(distance)
print(distance.to("cm"))
print(speed)
print(type(speed))
print(dtype(speed))
print(speed.value())  // Explicit raw Float64 boundary; retain speed.unit() alongside it.
print(speed.unit())

fn extend(distance: Quantity<m>, extra: Quantity<m> = 0.5@m) -> Quantity<m> {
    return distance + extra
}
print(extend(2.0@m))
print(1.0@m == 100.0@cm)