syntax_data: {"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"//!"}]}
source_snippet: //! with it in lockstep. When we need to resolve a body for `FnOnce` or `AsyncFnOnce`,
context_before: //! from them. This second body is stored alongside the first body, and optimized
context_after: //! we use this "by-move" body instead.