syntax_data: {"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"assert_eq!(i.intern_str(\"dog\"),"}]}
source_snippet:     assert_eq!(i.intern_str("dog"), Symbol::new(0));
context_before:     // first one is zero:
context_after:     // re-use gets the same entry, even with a `ByteSymbol`