named-def( $key => 15 ) Too many positionals passed; expected 0 arguments but got 1

[electricface]

sub named-def(:$def = 5 ){
    say $def 
}

my $key = 'def'
named-def( $key => 15 )
Too many positionals passed; expected 0 arguments but got 1

perl6 -v
This is perl6 version 2015.07.1 built on MoarVM version 2015.07

[vendethiel]

This is correct. You're passing a Pair to the function call (the dynamic key does that). You can use | to pass a hash as named parameters (fn(|%args)).