syntax_data: {"ast_node_type":"other","tokens":[{"end":32,"kind":"keyword","start":0,"text":"assert!(index"}]}
source_snippet:             assert!(index < 16);
context_before:             let index = self as u32 - Self::q0 as u32;
context_after:             let index = index * 2 + (modifier == 'f') as u32;