syntax_data: {"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"//!"}]}
source_snippet: //! by reference is now captured by value. This means that we consume the outer
context_before: //! *second* `async` coroutine body where that `x` that was previously captured
context_after: //! closure and return a new coroutine that will hold onto all of these captures,