syntax_data: {"ast_node_type":"variable","tokens":[{"end":54,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let variant_def = &adt_def.variant(index);
context_before:             debug!("print-type-size `{:#?}` variant {}", layout, adt_def.variant(index).name);
context_after:             let fields: Vec<_> = variant_def.fields.iter().map(|f| f.name).collect();