syntax_data: {"ast_node_type":"variable","tokens":[{"end":42,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let lhs = &self.thir[lhs];
context_before:             ExprKind::Field { lhs, variant_index, name } => {
context_after:                 if let ty::Adt(adt_def, _) = lhs.ty.kind() {