syntax_data: {"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"assert_eq!(i.intern_byte_str(b\"dog\"),"}]}
source_snippet:     assert_eq!(i.intern_byte_str(b"dog"), ByteSymbol::new(0));
context_before:     // re-use gets the same entry, even with a `ByteSymbol`
context_after:     // different string gets a different #: