clarified NEWS: document_files are officially required since Isabelle2014, but the absence was tolerated as legacy feature;
(* Title: HOL/SPARK/Manual/Simple_Greatest_Common_Divisor.thy
Author: Stefan Berghofer
Copyright: secunet Security Networks AG
*)
theory Simple_Greatest_Common_Divisor
imports "../SPARK" GCD
begin
spark_proof_functions
gcd = "gcd :: int \<Rightarrow> int \<Rightarrow> int"
spark_open "simple_greatest_common_divisor/g_c_d"
spark_vc procedure_g_c_d_4
using `0 < d` `gcd c d = gcd m n`
by (simp add: gcd_non_0_int)
spark_vc procedure_g_c_d_9
using `0 \<le> c` `gcd c 0 = gcd m n`
by simp
spark_end
end