10.4 ContinuationsContinuations in The Racket Guide introduces continuations. See Sub-expression Evaluation and Continuations and Prompts, Delimited Continuations, and Barriers for general information about continuations. Racket’s support for prompts and composable continuations [Flatt07] closely resembles Sitaram’s % and fcontrol operator [Sitaram93]. Racket installs a continuation barrier around