syntax_data: {"ast_node_type":"variable","tokens":[{"end":90,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let dyn_metadata = tcx.require_lang_item(LangItem::DynMetadata, DUMMY_SP);
context_before:             ty::Dynamic(_, _, ty::Dyn) => {
context_after:                 Ok(tcx.type_of(dyn_metadata).instantiate(tcx, &[tail.into()]))