An our-scoped variable is really just a lexical variable (like my) that – instead of having a Scalar freshly created per scope – is initialized by being bound to a symbol of that name in the Stash of the current package. So effectively, this: our $foo; Is doing this: my $foo := $?PACKAGE.WHO<$foo>; And so: … Read more
[*] See also “a better way to accomplish what I (OP) wanted”. See also “Some possible solutions” answer to “How can I completely flatten a Raku list (of lists (of lists) … )” question. Add a subscript my \perm = <a b c>.combinations(2)».permutations; say perm; # (((a b) (b a)) ((a c) (c a)) ((b … Read more
If your focus is generating messages for users of your grammar, see Generating Good Parse Errors from a Parser and Grammar::ErrorReporting. The rest of this answer is about development and debugging of grammars. May 2020 update The obvious choice now is to use the Grammar Live View feature of the Comma IDE. First, you can … Read more