unikernel/duniverse/dune_/test/blackbox-tests/test-cases/lib-modes.t

@@ -0,0 +1,49 @@
+Test library modes field
+
+  $ cat > dune-project <<EOF
+  > (lang dune 3.7)
+  > EOF
+
+  $ mkdir lib
+
+  $ cat > lib/dune <<EOF
+  > (library
+  >  (modes :standard \ native)
+  >  (name mylib))
+  > EOF
+
+  $ cat > lib/mylib.ml <<EOF
+  > let some_binding = "string"
+  > EOF
+
+  $ cat > dune <<EOF
+  > (executable
+  >  (name hello)
+  >  (libraries mylib))
+  > EOF
+
+  $ cat > hello.ml <<EOF
+  > let () =
+  >   print_endline Mylib.some_binding
+  > EOF
+
+Fails with an informative error message if we parsed OSL for modes
+in a version of dune lang that does not support them
+
+  $ dune build hello.exe
+  File "lib/dune", lines 1-3, characters 0-51:
+  1 | (library
+  2 |  (modes :standard \ native)
+  3 |  (name mylib))
+  Error: Ordered set language for modes is only available since version 3.8 of
+  the dune language. Please update your dune-project file to have (lang dune
+  3.8).
+  [1]
+
+  $ cat > dune-project <<EOF
+  > (lang dune 3.8)
+  > EOF
+
+Works for the most recent version
+
+  $ dune build hello.exe