| 1 | struct Logger {} |
| 2 | |
| 3 | fn (l Logger) log(this string) { |
| 4 | println(this) |
| 5 | } |
| 6 | |
| 7 | fn new_logger() &Logger { |
| 8 | return &Logger{} |
| 9 | } |
| 10 | |
| 11 | fn do_log(mut maybe_logr ?&Logger, this string) { |
| 12 | if logr := maybe_logr { |
| 13 | logr.log(this) |
| 14 | } |
| 15 | } |
| 16 | |
| 17 | fn bang(mut logr ?&Logger, this string) { |
| 18 | nested_log := fn [mut logr] (this string) { |
| 19 | do_log(mut logr, this) |
| 20 | } |
| 21 | nested_log(this) |
| 22 | } |
| 23 | |
| 24 | fn test_option_reference_params() { |
| 25 | mut logr := new_logger() |
| 26 | bang(mut &logr, 'bang!') |
| 27 | assert true |
| 28 | } |
| 29 |