syntax_data: {"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // (i.e. universally) implement copy/clone?
context_before:             // FIXME(unsafe_binder): Should we conditionally
context_after:             ty::UnsafeBinder(_) => unreachable!("tried to assemble `Sized` for unsafe binder"),