special named assertions

From an IRC conversation earlier today:

A quick scan of S05 reveals definitions for these seven special named assertions:
  <before pattern>
  <after pattern>
  <sp>
  <ws>
  <null>
  <'...'>
  <at($pos)>

Twenty-four more are listed in docs/Perl6/Overview/Rule.pod (some of which are used in S05, but I don't think there are definitions).
  <"...">
  <dot>
  <lt>
  <gt>
  <prior>
  <commit>
  <cut>
  <fail>
  <null>
  <ident>
  <self>
  <alnum>
  <alpha>
  <ascii>
  <blank>
  <cntrl>
  <digit>
  <graph>
  <lower>
  <print>
  <space>
  <upper>
  <word>
  <xdigit>
  <!XXX>  # not sure if this counts

Additionally, in t/regex/from_perl6_rules/stdrules.t there is one I didn't notice elsewhere, but appears to be implemented in Pugs:
  <punct>

As far as I can tell, this yields a total of 31 or 32 special named assertions.  I'm sure if I have missed any obvious ones, someone will speak up.  Some have passing tests, some have failing tests, and some have no tests.

Does it make sense to have a single place in S05 where all the builtin special named assertions are defined?  It would make it easier to link the tests, and to tell the difference between examples like <moose> and builtins like <ident>.

Last, but not least, should any of these be crossed off the list?

Best,
David.

• special named assertions by David Brunton
• Re: special named assertions by mark.a.biggar
• Re: special named assertions by Patrick R. Michaud
• Re: special named assertions by Patrick R. Michaud