syntax_data: {"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // the drop order for the first sub-branch, we lower sub-branches in reverse (#142163).
context_before:             // As a result, we end up with the drop order of the last sub-branch we lower. To use
context_after:             let target_block = self.cfg.start_new_block();