syntax_data: {"ast_node_type":"variable","tokens":[{"end":37,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let (pin_bb, fut_pin_place) =
context_before:         let yield_block = insert_term_block(body, TerminatorKind::Unreachable); // `kind` replaced later to yield
context_after:             build_pin_fut(tcx, body, fut_place.clone(), UnwindAction::Continue);