syntax_data: {"ast_node_type":"variable","tokens":[{"end":72,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let val = tcx.mk_place_field(result_value, val_fld, ty);
context_before:                 let tcx = self.tcx;
context_after:                 let of = tcx.mk_place_field(result_value, of_fld, bool_ty);