Something

alias eval {
  if ([ [ $1- ] ]) {
    set %_ticks $ticks
    say $chr(91) $+ $1- $+ $chr(93) ==> $eval($1-,2) $+($chr(91),$calc($ticks - %_ticks),ms,$chr(93))
    halt
    :error
    set %_ticks $ticks
    say $chr(91) $+ $1- $+ $chr(93) ==> Error: $gettok($error,1-,$chr(58)) $+($chr(91),$calc($ticks - %_ticks),ms,$chr(93))
    halt
  }
  elseif ($eval($1-,2) == $null) {
    set %_ticks $ticks
    say $chr(91) $+ $1- $+ $chr(93) ==> $ $+ null $+($chr(91),$calc($ticks - %_ticks),ms,$chr(93)) 
    halt
    :error
    set %_ticks $ticks
    say $chr(91) $+ $1- $+ $chr(93) ==> Error: $gettok($error,1-,$chr(58)) $+($chr(91),$calc($ticks - %_ticks),ms,$chr(93))
    halt
  }
}