Implemented reading from struct fields

tests/examples_test.go

@@ -24,6 +24,7 @@ var examples = []struct {
 	{"itoa", "", "9223372036854775807", 0},
 	{"collatz", "", "6 3 10 5 16 8 4 2 1", 0},
 	{"fizzbuzz", "", "1 2 Fizz 4 Buzz Fizz 7 8 Fizz Buzz 11 Fizz 13 14 FizzBuzz", 0},
+	{"point", "", "x 1\ny 2\n", 0},
 	{"prime", "", "2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97", 0},
 }