*scratch*.el

;; This buffer is for text that is not saved, and for Lisp evaluation.
;; To create a file, visit it with <f20> and enter text in its buffer.

(require 'dash)
(require 's)
;;(require 'yaml-mode)
(require 'tramp)
(require 'subr-x)
(require 'eshell)
(require 'dired)

(cl-defun get-nth-opensuse-build (n &optional (v 1))
  (let* ((json-hash (with-current-buffer
			(url-retrieve-synchronously (format "https://openqa.opensuse.org/group_overview/%s.json" v))
		      (goto-char (point-min))
		      (re-search-forward "^$")
		      (delete-region (point) (point-min))
		      (json-parse-buffer)))
	 (builds (gethash "build_results" json-hash))
	 (last-build (aref builds n)))
    (message "%S" last-build)
    (list nil
	  (vector
	   (gethash "version" last-build)
	   (number-to-string (gethash "total" last-build))
	   (number-to-string (gethash "passed" last-build))
	   (number-to-string (gethash "failed" last-build))
	   (number-to-string (gethash "unfinished" last-build))))))

(trace-function 'get-nth-opensuse-build 0)
(get-nth-opensuse-build 0)

Wrong type argument: stringp, 0