syntax_data: {"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"Span::new(BytePos::from_usize(lo),"}]}
source_snippet:         Span::new(BytePos::from_usize(lo), BytePos::from_usize(hi), SyntaxContext::root(), None)
context_before:     let span = |lo: usize, hi: usize| {
context_after:     };