syntax_data: {"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":".fold(Tree::uninhabited(),"}]}
source_snippet:                 .fold(Tree::uninhabited(), |alts, alt| alts.or(alt)),
context_before:                 .map(|alt| alt.prune(f))
context_after:             Self::Byte(b) => Tree::Byte(b),