syntax_data: {"ast_node_type":"function","tokens":[{"end":86,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn unsizing_params_for_adt(self, adt_def_id: Self::DefId) -> Self::UnsizingParams;
context_before:     type UnsizingParams: Deref<Target = DenseBitSet<u32>>;