syntax_data: {"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"(ty::ValTreeKind::Leaf(leaf),"}]}
source_snippet:             (ty::ValTreeKind::Leaf(leaf), ty::Ref(_, inner_ty, _)) => {
context_before:             }
context_after:                 write!(self, "&")?;