syntax_data: {"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // `noalias` for it. This can be turned off using an unstable flag.
context_before:             // The aliasing rules for `Box<T>` are still not decided, but currently we emit
context_after:             // See https://github.com/rust-lang/unsafe-code-guidelines/issues/326