12 pub enum Event {  enum
38     stack: Vec<(Event, ir::Block)>,
57             self.stack.push((Event::Enter, e));  in iter()
92     type Item = (Event, ir::Block);
94     fn next(&mut self) -> Option<(Event, ir::Block)> {  in next()  argument
98             if event == Event::Enter {  in next()
104                 self.dfs.stack.push((Event::Exit, block));  in next()
124                         .map(|block| (Event::Enter, block)),  in next()
143                 (Event::Enter, b) => return Some(b),  in next()
144                 (Event::Exit, _) => continue,  in next()
160                 (Event::Exit, b) => return Some(b),  in next()
161                 (Event::Enter, _) => continue,  in next()
216                 (Event::Enter, block0),  in test_dfs_traversal()
217                 (Event::Enter, block2),  in test_dfs_traversal()
218                 (Event::Exit, block2),  in test_dfs_traversal()
219                 (Event::Enter, block3),  in test_dfs_traversal()
220                 (Event::Exit, block3),  in test_dfs_traversal()
221                 (Event::Exit, block0)  in test_dfs_traversal()
260                 (Event::Enter, block0),  in multiple_successors_to_the_same_block()
261                 (Event::Enter, block1),  in multiple_successors_to_the_same_block()
262                 (Event::Exit, block1),  in multiple_successors_to_the_same_block()
263                 (Event::Exit, block0),  in multiple_successors_to_the_same_block()