syntax_data: {"ast_node_type":"function","tokens":[{"end":55,"kind":"keyword","start":0,"text":"pub(crate)"}]}
source_snippet:     pub(crate) fn number(width_in_bytes: u64) -> Self {
context_before:     /// A `Tree` whose layout is a number of the given width.
context_after:         Self::Seq(vec![Self::u8(); width_in_bytes.try_into().unwrap()])