Just for fun! This is unlikely to be useful or reasonable.
use forkallcc::call_cc;
fn main() {
assert_eq!(1, call_cc(|k| {
k.invoke(1);
0
}));
}Based on cccallcc for C++. See the original writeup for more about this approach, including its numerous limitations.
$ cargo test
$ ./target/examples/simple
early_return: closure called
early_return: closure returns 1
double_return: closure called
double_return: closure returns 0
double_return: closure returns 1
double_return: no saved continuation
$ ./target/examples/backtrack; sleep 2
17 * 23 = 391
XX------------+
|XXXXXXX| |
|--+ |X| | |
| | |X| --+ |
| |XXXXX| |
|-+---+--+-X| |
| |XXX | XXX|
| |X|X---+-+-X|
|XXX|XXXXXX|XX|
|X+-+-+--|XXX |
|X| | |--- |
|XXXX | |
|---X-+-------|
| XXXXXXXXXXX
+-------------X
