Add test SearchFixpoint

test-suite/output/SearchFixpoint.out

@@ -0,0 +1,3 @@
+Foo.bar: nat -> nat
+Foo.from: nat -> Foo.Stream
+Foo.foo: nat

test-suite/output/SearchFixpoint.v

@@ -0,0 +1,21 @@
+(** Test file for #18983 *)
+
+(** We test that [Search] allows the [is:Fixpoint] and [is:CoFixpoint] search
+    items while not changing [is:Definition]. *)
+Module Foo.
+Definition foo := 42.
+
+Fixpoint bar (n : nat) :=
+  match n with
+  | 0 => 0
+  | S n => bar n
+  end.
+
+(* Example shamelessly taken from the reference manual. *)
+CoInductive Stream := Seq : nat -> Stream -> Stream.
+CoFixpoint from (n : nat) := Seq n (from (S n)).
+End Foo.
+
+Search is:Fixpoint inside Foo.
+Search is:CoFixpoint inside Foo.
+Search is:Definition inside Foo.