unikernel/duniverse/dune_/test/blackbox-tests/test-cases/melange/transitive-ppx.t

@@ -0,0 +1,40 @@
+Test interaction of melange.emit library ppx dependencies
+
+  $ mkdir lib test ppx
+  $ cat > dune-project <<EOF
+  > (lang dune 3.8)
+  > (package (name mel-subdir))
+  > (using melange 0.1)
+  > EOF
+
+  $ mkdir lib/test
+  $ touch lib/dune
+
+  $ mkdir lib/impl
+  $ cat > lib/impl/dune <<EOF
+  > (library
+  >  (name subdir)
+  >  (modes melange)
+  >  (public_name mel-subdir)
+  >  (preprocess (pps not-present)))
+  > EOF
+  $ touch lib/impl/subdir.ml
+
+  $ cat > lib/test/dune <<EOF
+  > (melange.emit
+  >  (target dist)
+  >  (emit_stdlib false)
+  >  (modules)
+  >  (libraries subdir))
+  > EOF
+
+  $ dune build
+  File "lib/impl/dune", line 5, characters 18-29:
+  5 |  (preprocess (pps not-present)))
+                        ^^^^^^^^^^^
+  Error: Library "not-present" not found.
+  -> required by library "mel-subdir" in _build/default/lib/impl
+  -> required by melange target dist
+  -> required by alias lib/test/all
+  -> required by alias default
+  [1]