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sub slick()
{
...
{
    log-error( ~$result );
}

sub slick()
{
...
-> $error {
  log-error $error.exception.message
}

proto sub log-error ( $ ) {*}
multi sub log-error ( Str $message ) {
...
multi sub log-error ( Failure $failure ) {
  samewith $failure.exception.message
}

# this has the same effect as `but False`
'Some error message' but role { method Bool ( --> False ) {} }