use v6.c;
say $*PERL.compiler.version;

class ClassA {};
class ClassB {}
class ClassC {
    has $.foo;
    has $!bar;
};

my $class;
given 2 {
    when 0 { $class = ClassA }
    when 1 { $class = ClassB }
    default { $class = ClassC }
}

say my $obj = $class.new( foo => 1, bar => 1 );