student languages. This will be a problem if somebody writes a
function in BSL or BSLLA, provides it, requires it in a non-student
language, and uses it as an argument to a higher-order function
that isn't declared as a "higher order primitive". That is,
not very often. Even if so, just re-open the BSL or BSLLA source
file, switch languages to ISL, save it, and the problem goes away.
