Add reminder for 6.d

To properly reserve all C<< :sym<> >> colonpairs on subroutines
Impl[^1] (commented out) and tests[^2] (fudged) already exist.

[1] rakudo/rakudo@48abeeef26
[2] Raku/roast@53d6e8491d

Author: zoffixznet

v6d.pod

@@ -132,4 +132,21 @@ in 6.c-errata without any changes.
 
 Oh, I thought you said steak... (Zoffix)
 
+=head1 Properly reserve all C<< :sym<> >> colonpairs on subroutines
+
+This is mostly a reminder so we don't forget. As
+L<previously discussed|https://irclog.perlgeek.de/perl6/2017-01-25#i_13988093>,
+We want to make C<< :sym<> >> colonpairs on subroutines reserved. However,
+there is L<a 6.c-errata test|https://github.com/perl6/roast/blob/dfe905a8ce84d09b5b0536fcc151e798488a9289/S32-exceptions/misc.t#L132>
+that expects C<< sub foo:sym<bar> {} >> to throw C<X::Syntax::Extension::Category>
+exception instead of C<X::Syntax::Reserved> we desire. The
+L<code implementing this|https://github.com/rakudo/rakudo/commit/48abeeef26> already
+exists. It just needs to be uncommented for 6.d and 
+L<corresponding tests|https://github.com/perl6/roast/commit/53d6e8491d> unfudged.
+
+
+=head2 Stakeholder
+
+Zoffix
+
 =cut