IIRC the idea was that in some cases you should be able to do this without commas. I don't think we need an RFC for this, somebody just has to implement it properly.
Also, I think there are several tickets related to this problem. Maybe worth looking for other ones. On 2016-01-03 10:09:47, c...@zoffix.com wrote: > If, when constructing a hash, a comma is ommited, that particular key > will be missing from that hash and no error or warning is generated. > This it LTA, as can be a source of hard-to-find bugs. Either comma- > less assignment should Just Work or an error/warning should be > generated. > > <Zoffix> m: my %h = :foo<bar> :ber<boor>, :meow<moo>; say %h > <camelia> rakudo-moar b5cb00: OUTPUT«foo => bar, meow => moo» > > Relevant IRC conversation: http://irclog.perlgeek.de/perl6/2016-01- > 03#i_11822917