syntax_data: {"ast_node_type":"variable","tokens":[{"end":41,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let (sig_tys, hdr) = fty.split();
context_before:     pub fn new_fn_ptr(tcx: TyCtxt<'tcx>, fty: PolyFnSig<'tcx>) -> Ty<'tcx> {
context_after:         Ty::new(tcx, FnPtr(sig_tys, hdr))