syntax_data: {"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // (The dummy is added by `break_scope` and `break_for_else`.)
context_before:         // dummy TerminatorKind. Replace it with a proper goto.
context_after:         let term = cfg.block_data_mut(from).terminator_mut();