syntax_data: {"ast_node_type":"variable","tokens":[{"end":67,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let layout = layout::Tree::<Def, !, !>::nonzero(width);
context_before:         for width in NONZERO_BYTE_WIDTHS {
context_after:             assert_eq!(is_transmutable(&layout, &layout, Assume::default()), Answer::Yes);