syntax_data: {"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:         if !sub_ty.is_inhabited_from(cx.tcx, cx.module, cx.typing_env) {
context_before:     if let ty::Ref(_, sub_ty, _) = scrut_ty.kind() {
context_after:             err.note("references are always considered inhabited");