syntax_data: {"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"writeln!(f,"}]}
source_snippet:                     writeln!(f, "\u{001f}-{}: {:?}", place_str, old.get(value))?;
context_before:                 if new.get(value) != old.get(value) {
context_after:                     writeln!(f, "\u{001f}+{}: {:?}", place_str, new.get(value))?;