syntax_data: {"ast_node_type":"function","tokens":[{"end":78,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet:     pub fn integer<N: TryInto<usize> + Copy + itoa::Integer>(n: N) -> Symbol {
context_before:     /// are fast.
context_after:         if let Result::Ok(idx) = n.try_into() {