syntax_data: {"ast_node_type":"variable","tokens":[{"end":56,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let hir_id = tcx.local_def_id_to_hir_id(def_id);
context_before:         let sp = tcx.def_span(def_id);
context_after:         tcx.emit_node_span_lint(