syntax_data: {"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"bug!(\"unsizing"}]}
source_snippet:                     bug!("unsizing {ty:?} changed field order!\n{layout:?}\n{unsized_layout:?}");
context_before:                 if sized_fields != unsized_fields {
context_after:                 }