src/HOL/SPARK/Manual/Proc2.thy

clarified NEWS: document_files are officially required since Isabelle2014, but the absence was tolerated as legacy feature;

theory Proc2
imports "../SPARK"
begin

spark_open "loop_invariant/proc2"

spark_vc procedure_proc2_7
  by (simp add: ring_distribs pull_mods)

spark_end

end