syntax_data: {"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // (e.g.: that `src != 3u8` when the destination type is `bool`)
context_before:                 // if the compiler may assume that the programmer is doing additional validity checks,
context_after:                 // then there must exist at least one transition out of `src_state` such that the transmute is viable...