syntax_data: {"ast_node_type":"variable","tokens":[{"end":74,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let hir_sig = tcx.hir_node_by_def_id(item).fn_decl().unwrap();
context_before:         DefKind::AssocFn | DefKind::Fn => {
context_after:             // If the type of the item uses `_`, we're gonna error out anyway, but