syntax_data: {"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"field_tys.len()"}]}
source_snippet:                 field_tys.len() <= 3 && field_tys.iter().all(Self::is_trivially_pure_clone_copy)
context_before:             ty::Tuple(field_tys) => {
context_after:             }