syntax_data: {"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":"(ty,"}]}
source_snippet:             (ty, layout): (Ty<'tcx>, Layout<'tcx>),
context_before:             tag: Option<(ScalarInt, VariantIdx, TagEncoding<VariantIdx>)>,
context_after:             total_size: Size,