syntax_data: {"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                             // FIXME(@joshlf): Support `NonZero` types:
context_before:                         (AdtKind::Struct, Included(1), Included(_hi)) if is_transparent => {
context_after:                             // - Check to make sure that the first field is