syntax_data: {"ast_node_type":"other","tokens":[{"end":93,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: /// `sizedness` trait for the whole ADT to be considered to implement that `sizedness` trait.
context_before: /// Returns the type of the last field of a struct ("the constraint") which must implement the
context_after: /// `def_id` is assumed to be the `AdtDef` of a struct and will panic otherwise.