unikernel/duniverse/dune_/test/blackbox-tests/test-cases/more-than-one-optional.t

@@ -0,0 +1,33 @@
+Demonstrate an optional executable available from more than one definition
+
+  $ cat >dune-project <<EOF
+  > (lang dune 3.13)
+  > (package (name foo))
+  > EOF
+
+  $ mkdir a b
+  $ touch a/foo.ml b/foo.ml
+  $ cat >a/dune <<EOF
+  > (executable
+  >  (public_name foo)
+  >  (enabled_if true))
+  > EOF
+  $ cat >b/dune <<EOF
+  > (executable
+  >  (public_name foo)
+  >  (enabled_if true))
+  > EOF
+  $ cat >dune <<EOF
+  > (rule
+  >  (alias foo)
+  >  (action (run %{bin:foo})))
+  > EOF
+
+  $ dune build @foo
+  File "b/dune", line 2, characters 14-17:
+  2 |  (public_name foo)
+                    ^^^
+  Error: binary "foo" is available from more than one definition. It is also
+  available in:
+  - a/dune:2
+  [1]