syntax_data: {"ast_node_type":"other","tokens":[{"end":94,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // they can be deallocated at any time. Same for non-frozen shared references (see
context_before:             // `Box` are not necessarily dereferenceable for the entire duration of the function as
context_after:             // <https://github.com/rust-lang/rust/pull/98017>), and for mutable references to