raku - How to export %*SUB-MAIN-OPTS

Question

Assuming there is a Module that contains the sub MAIN's which is supposed to improve the startup speed. Unfortunately I am unable to use the named-anywhere feature that way. Is my export broken or what am I supposed to do?

use v6.c;

unit module My::Main;
our %*SUB-MAIN-OPTS is export = ( 'named-anywhere' => True);

multi sub MAIN() is export {
    say 1;
}

multi sub MAIN('a', :$pa) is export {
    say $pa;
}

Answer 1

You cannot currently export dynamic variables that way, and maybe we never will.

In the meantime, since this is usually in the context of Command Line scripts, there is a way around this:

# in your module:
PROCESS::<%SUB-MAIN-OPTS><named-anywhere> = True;

# in your script
dd %*SUB-MAIN-OPTS'
# Hash element = ${:named-anywhere}

What you're doing there is that your setting the named-anywhere key in the %SUB-MAIN-OPTS hash that lives in the PROCESS:: namespace. That is the outer namespace in which dynamic variables are looked up if they cannot be found anywhere else in the stack. Note that the assignment to the key named-anywhere will actually vivify the hash if it doesn't exist yet. So this will not interfere with any other future additions to the %SUB-MAIN-OPTS hash.