b) can we introduce some flag for plpgsql_parser, that allows storing comments in AST (it will not be default).
so "-- plpgsql_check: OFF " will work for my purpose, and I don't need any special syntax.
Comments, notes?
When I started work on PoC I found that it was not a good idea. Comments can be everywhere, but it is not possible to enhance plpgsql's gram in this way. So this is not an way