syntax_data: {"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"!tcx.type_of(last_field.did).instantiate_identity().is_sized(tcx,"}]}
source_snippet:                     !tcx.type_of(last_field.did).instantiate_identity().is_sized(tcx, typing_env)
context_before:                     let typing_env = ty::TypingEnv::post_analysis(tcx, def.did());
context_after:                 });