d;
    if the second noun is full, say "[The second noun] cannot contain any more than it already holds." instead.

Carry out pouring it into:
    let available capacity be the fluid capacity of the second noun minus the current volume of the second noun;
    if the available capacity is greater than the current volume of the noun, now the available capacity is the current volume of the noun;
    increase the current volume of the second noun by available capacity;
    decrease the current volume of the nou