syntax_data: {"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"//"}]}
source_snippet: // only one copy will be stored and the resulting `Symbol` and `ByteSymbol`
context_before: // string with identical contents (e.g. "foo" and b"foo") are both interned,
context_after: // will have the same index.