evalable6

query

my @a = 'a'..'g'; @a = @a Z Pair.new('whee', True) xx @a.elems; sub sayLetter ($a, :$whee) { say "$a,$whee" }; @a.race.map({ sayLetter(|$_) })

result

(exit code 1) 
A worker in a parallel iteration (hyper or race) initiated here:
  in block <unit> at /tmp/sbGcpHTCja line 1

Died at:
    Too many positionals passed; expected 1 argument but got 2
      in sub sayLetter at /tmp/sbGcpHTCja line 1
      in block  at /tmp/sbGcpHTCja line 1