Calling test-parser results in out of memory error. Reducing the number of elements in the string does get it to work.

gistfile1.clj

(ns parser.testing
  (:require [instaparse.core :as insta]))

(def textparse
  (insta/parser
   "S = (Content)*
    Content = (ContentLine)*
    ContentLine = (Word | Whitespace)+ LineEnd?
    <Word> = #'\\S+'
    <Whitespace> = #'\\s*'
    LineEnd = '\\n'"
   ))
   
(defn test-parser []
  (textparse "1 2 3 4 5 6 7 8 9 0"))