syntax_data: {"ast_node_type":"other","tokens":[{"end":35,"kind":"keyword","start":0,"text":"assert_eq!("}]}
source_snippet:                         assert_eq!(
context_before:                         assert_eq!(is_transmutable(&mu, &u8, assume), want, "assume: {assume:?}");
context_after:                             is_transmutable(&u8, &mu, assume),