it clashes with the shebang, the initial #! should be excluded... Dunno how thought.

pretty name for the CASE on a UNION value

In Algol68 pretty almost everything seems to yield a value (except loops, mode declarations and... ?) so it's easier (and probably more correct) to have "exprs" instead of "insts" (instructions) everywhere. The "resolvers" are probably wrong, but so far they work.