syntax_data: {"ast_node_type":"other","tokens":[{"end":19,"kind":"keyword","start":0,"text":"assert_eq!("}]}
source_snippet:         assert_eq!(
context_before:         assert_eq!(is_transmutable(&src, &src, Assume::default()), Answer::Yes);
context_after:             is_transmutable(&src, &src, Assume { validity: true, ..Assume::default() }),