syntax_data: {"ast_node_type":"other","tokens":[{"end":100,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // Byte string literal patterns may have type `[u8]` or `[u8; N]` if `deref_patterns` is
context_before:         {
context_after:             // enabled, in order to allow, e.g., `deref!(b"..."): Vec<u8>`.