syntax_data: {"ast_node_type":"function","tokens":[{"end":87,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet:     pub fn is_sized(self, tcx: TyCtxt<'tcx>, typing_env: ty::TypingEnv<'tcx>) -> bool {
context_before:     /// actually carry lifetime requirements.
context_after:         self.has_trivial_sizedness(tcx, SizedTraitKind::Sized)