syntax_data: {"ast_node_type":"other","tokens":[{"end":22,"kind":"keyword","start":0,"text":")"}]}
source_snippet: ) -> ty::FnSig<'tcx> {
context_before:     typing_env: ty::TypingEnv<'tcx>,
context_after:     if let InstanceKind::ThreadLocalShim(..) = instance.def {