syntax_data: {"ast_node_type":"function","tokens":[{"end":68,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn mock_entry_set(&self, bb: BasicBlock) -> DenseBitSet<usize> {
context_before:     /// avoid colliding with the statement/terminator effects.
context_after:         let mut ret = self.bottom_value(self.body);