syntax_data: {"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // If the read returns bytes however, we just fall back to reading into a Vec then turning
context_before:         // already done, and we just return the Arc we built above.
context_after:         // that into an Arc, losing our nice peak memory behavior. This fallback code path should