无标签树 julia > using TaglessTrees julia > add (args ... ) = call ( + , args ... ) add (generic function with 1 method) julia > t = add ( term ( 2 ), term ( 3 )) # 1 (generic function with 1 method) julia > evaluate (t) 5 julia > trace (t) term ( 2 ) term ( 3 ) call ( + , ... ) 5
