syntax_data: {"ast_node_type":"variable","tokens":[{"end":91,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let parent_count = parent_generics.parent_count + parent_generics.own_params.len();
context_before:         let parent_generics = tcx.generics_of(impl_local_def_id.to_def_id());