Makes a hole that matches a term (either a substitution-arg or a
specimen), and either evaluates to it (if this is a dollar-hole) or
extracts it (if this is an at-hole).
Untamed: Given a template string in the language this quasi parser understands,
parse it into a ValueMaker which will generate objects of the form the
template describes.
Untamed: Given a template string in the language this quasi parser understands,
parse it into a MatchMaker which will match objects of the form the
template describes.