syntax_data: {"ast_node_type":"variable","tokens":[{"end":29,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let mut bytes = 0u64;
context_before:     pub(crate) fn parse_align(slot: &mut Option<Align>, v: Option<&str>) -> bool {
context_after:         if !parse_number(&mut bytes, v) {