clarified NEWS: document_files are officially required since Isabelle2014, but the absence was tolerated as legacy feature;
(* Author: Stefan Berghofer, Lukas Bulwahn, TU Muenchen *)
section {* Simple example for table-based implementation of the reflexive transitive closure *}
theory Transitive_Closure_Table_Ex
imports "~~/src/HOL/Library/Transitive_Closure_Table"
begin
datatype ty = A | B | C
inductive test :: "ty \<Rightarrow> ty \<Rightarrow> bool"
where
"test A B"
| "test B A"
| "test B C"
text {* Invoking with the predicate compiler and the generic code generator *}
code_pred test .
values "{x. test\<^sup>*\<^sup>* A C}"
values "{x. test\<^sup>*\<^sup>* C A}"
values "{x. test\<^sup>*\<^sup>* A x}"
values "{x. test\<^sup>*\<^sup>* x C}"
value "test\<^sup>*\<^sup>* A C"
value "test\<^sup>*\<^sup>* C A"
end