syntax_data: {"ast_node_type":"other","tokens":[{"end":29,"kind":"keyword","start":0,"text":"Tree::unit(),"}]}
source_snippet:                 Tree::unit(),
context_before:             Self::Seq(elts) => match elts.into_iter().map(|elt| elt.prune(f)).try_fold(
context_after:                 |elts, elt| {