syntax_data: {"ast_node_type":"struct","tokens":[{"end":69,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                     // The struct is as large as the last field's end
context_before:                     let offset = variant_layout.fields.offset(field_idx);
context_after:                     variant_size = variant_size.max(offset + field_layout.size);