use cl-lib function

Author: clarkhenry

solidity-flycheck.el

@@ -212,7 +212,7 @@ no .soliumrc.json is found, `project-roots' is used."
 (defun solidity-flycheck--solc-remappings ()
  (let* ((allow-paths (solidity-flycheck--solc-allow-paths)))
  (->> allow-paths
- (remove-if-not #'file-exists-p)
+ (cl-remove-if-not #'file-exists-p)
  (mapcar #'solidity-flycheck--only-subdirectories)
  -flatten
  (mapcar