syntax_data: {"ast_node_type":"function","tokens":[{"end":27,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet: fn fn_sig_for_fn_abi<'tcx>(
context_before: #[tracing::instrument(level = "debug", skip(tcx, typing_env))]
context_after:     tcx: TyCtxt<'tcx>,