syntax_data: {"ast_node_type":"variable","tokens":[{"end":92,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let field = FieldIdx::from_u32(self.parse_integer_literal(args[1])? as u32);
context_before:                 let (parent, place_ty) = self.parse_place_inner(args[0])?;
context_after:                 let field_ty = PlaceTy::field_ty(self.tcx, place_ty.ty, place_ty.variant_index, field);