syntax_data: {"ast_node_type":"struct","tokens":[{"end":80,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: /// `def_id` is assumed to be the `AdtDef` of a struct and will panic otherwise.
context_before: /// `sizedness` trait for the whole ADT to be considered to implement that `sizedness` trait.
context_after: ///