unikernel/duniverse/dune_/test/blackbox-tests/test-cases/test-build-if/version.t

@@ -0,0 +1,25 @@
+  $ cat > dune-project << EOF
+  > (lang dune 3.8)
+  > EOF
+
+  $ cat > dune << EOF
+  > (test
+  >  (name t)
+  >  (build_if true))
+  > EOF
+
+  $ touch t.ml
+
+  $ dune build
+  File "dune", line 3, characters 1-16:
+  3 |  (build_if true))
+       ^^^^^^^^^^^^^^^
+  Error: 'build_if' is only available since version 3.9 of the dune language.
+  Please update your dune-project file to have (lang dune 3.9).
+  [1]
+
+  $ cat > dune-project << EOF
+  > (lang dune 3.9)
+  > EOF
+
+  $ dune build