flycheck_racket.rkt:4:2: read-syntax: expected a `)` to close `(`
  context...:
   /usr/share/racket/pkgs/compiler-lib/compiler/commands/expand.rkt:32:13
   /usr/share/racket/pkgs/compiler-lib/compiler/commands/expand.rkt:10:2: show-program
   body of "/usr/share/racket/pkgs/compiler-lib/compiler/commands/expand.rkt"
   /usr/share/racket/collects/raco/raco.rkt:41:0
   body of "/usr/share/racket/collects/raco/raco.rkt"
   body of "/usr/share/racket/collects/raco/main.rkt"
(define-values (listener) (#%app (#%top . tcp-listen) '12345))
