syntax_data: {"ast_node_type":"other","tokens":[{"end":76,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // See `tests/ui/layout/trivial-bounds-sized.rs` for an example.
context_before:             // This is sometimes not a compile error if there are trivially false where clauses.
context_after:             assert!(field.layout.is_unsized(), "invalid layout error {err:#?}");