Merge PR #13920: Adding an Ltac2 API to manipulate inductive types.

Reviewed-by: JasonGross
Ack-by: jfehrle

1 files changed, 25 insertions, 0 deletions

diff --git a/test-suite/ltac2/ind.v b/test-suite/ltac2/ind.v
new file mode 100644
index 0000000000..6f7352d224
--- /dev/null
+++ b/test-suite/ltac2/ind.v
@@ -0,0 +1,25 @@
+Require Import Ltac2.Ltac2.
+Require Import Ltac2.Option.
+
+Ltac2 Eval
+  let nat := Option.get (Env.get [@Coq; @Init; @Datatypes; @nat]) in
+  let nat := match nat with
+  | Std.IndRef nat => nat
+  | _ => Control.throw Not_found
+  end in
+  let data := Ind.data nat in
+  (* Check that there is only one inductive in the block *)
+  let ntypes := Ind.nblocks data in
+  let () := if Int.equal ntypes 1 then () else Control.throw Not_found in
+  let nat' := Ind.repr (Ind.get_block data 0) in
+  (* Check it corresponds *)
+  let () := if Ind.equal nat nat' then () else Control.throw Not_found in
+  let () := if Int.equal (Ind.index nat) 0 then () else Control.throw Not_found in
+  (* Check the number of constructors *)
+  let nconstr := Ind.nconstructors data in
+  let () := if Int.equal nconstr 2 then () else Control.throw Not_found in
+  (* Create a fresh instance *)
+  let s := Ind.get_constructor data 1 in
+  let s := Env.instantiate (Std.ConstructRef s) in
+  constr:($s 0)
+.