syntax_data: {"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":"init.iter().copied().chain(extra.iter().copied()).map(|str|"}]}
source_snippet:             init.iter().copied().chain(extra.iter().copied()).map(|str| str.as_bytes()),
context_before:         let byte_strs = FxIndexSet::from_iter(
context_after:         );