syntax_data: {"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"Self::Seq(vec![Self::uninit();"}]}
source_snippet:         Self::Seq(vec![Self::uninit(); width_in_bytes])
context_before:     pub(crate) fn padding(width_in_bytes: usize) -> Self {
context_after:     }