syntax_data: {"ast_node_type":"other","tokens":[{"end":117,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // If `candidate` has become a leaf candidate, ensure it has a `pre_binding_block` and `otherwise_block`.
context_before:         if candidate.subcandidates.is_empty() {
context_after:             let next_block = self.cfg.start_new_block();