Is this line a comment?

Compile each non-comment line of the file indicated by this filename into an executable anonymous function, and return the sequence of such functions.

Compile each non-comment line of this string into an executable anonymous function, and return the sequence of such functions.

Parse rules from successive lines in the file loaded from this filename. Return a list of S-expressions.

Parse rules from successive lines in this string, assumed to have multiple lines delimited by the new-line character. Return a list of S-expressions.