syntax_data: {"ast_node_type":"function","tokens":[{"end":71,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn looks_like_width_suffix(first_chars: &[char], s: &str) -> bool {
context_before:     // Checks if `s` looks like i32 or u1234 etc.
context_after:         s.len() > 1 && s.starts_with(first_chars) && s[1..].chars().all(|c| c.is_ascii_digit())