syntax_data: {"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":".take_while(|c|"}]}
source_snippet:                 .take_while(|c| *c != 'i' && *c != 'u')
context_before:                 .filter(|c| *c != '_')
context_after:                 .all(|c| c.to_digit(base).is_some());