Author: Larry Wall <la...@wall.org>
Date: 2011-12-29 (Thu, 29 Dec 2011)
simplify sigspace rule
Only constructs that are actual matchers look for following sigspace.
Colon declarations, opening brackets, disjunctions/conjunctions, and
closures specifically do not. The beginning of a rule does not, so
the TOP rule may need to account for leading whitespace. (A ^ followed
by whitespace is sufficient for this.)