syntax_data: {"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"Ok(tcx.type_of(dyn_metadata).instantiate(tcx,"}]}
source_snippet:                 Ok(tcx.type_of(dyn_metadata).instantiate(tcx, &[tail.into()]))
context_before:                 let dyn_metadata = tcx.require_lang_item(LangItem::DynMetadata, DUMMY_SP);
context_after:             }