style nit: cond on its own line

racket/src/expander/common/promise.rkt

@@ -11,9 +11,11 @@
 (define-syntax-rule (delay e) (promise (lambda () e) #f))
 
 (define (force v)
-  (cond [(promise? v)
+  (cond
+    [(promise? v)
      (define s (promise-status v))
-         (cond [(not s)
+     (cond
+       [(not s)
         (define result ((promise-val v)))
         (set-promise-val! v result)
         (set-promise-status! v #t)