@main[][local]
$result(true)
$result[^print[]]

@print[arg]

object/string: $caller

expression: ^try-catch{^eval($caller)}

hash: ^try-catch{$h[^hash::create[$caller]] ^json:string[$h]}

table: ^try-catch{^table::create[$caller]}

def: ^try-catch{^if(def $caller){true}{false}}

bool: ^try-catch{^if($caller || 0){true}{false}}

double: ^try-catch{^eval($caller + 0)}