syntax_data: {"ast_node_type":"function","tokens":[{"end":63,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet:     pub fn fn_sig(self, tcx: TyCtxt<'tcx>) -> PolyFnSig<'tcx> {
context_before:     #[tracing::instrument(level = "trace", skip(tcx))]
context_after:         self.kind().fn_sig(tcx)