syntax_data: {"ast_node_type":"other","tokens":[{"end":7,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     ///
context_before:     /// [`ty::ClosureKind::FnMut`] for the purpose of the generated MIR bodies.
context_after:     /// This method should be used when constructing a `Coroutine` out of a