test: reproduce @ocaml-index failing with package management

test/blackbox-tests/test-cases/ocaml-index/gh10985/dune

@@ -0,0 +1,4 @@
+(dirs (:standard \ external_sources))
+(library
+ (name foo)
+ (libraries mypkg.lib))

test/blackbox-tests/test-cases/ocaml-index/gh10985/dune-project

@@ -0,0 +1 @@
+(lang dune 3.17)

test/blackbox-tests/test-cases/ocaml-index/gh10985/dune.lock/lock.dune

@@ -0,0 +1 @@
+(lang package 0.1)

test/blackbox-tests/test-cases/ocaml-index/gh10985/external_sources/dune

@@ -0,0 +1,3 @@
+(library
+ (public_name mypkg.lib)
+ (name test_lib))

test/blackbox-tests/test-cases/ocaml-index/gh10985/external_sources/dune-project

@@ -0,0 +1,2 @@
+(lang dune 3.11)
+(package (name mypkg))

test/blackbox-tests/test-cases/ocaml-index/gh10985/external_sources/test_lib.ml

@@ -0,0 +1 @@
+let x = ()

test/blackbox-tests/test-cases/ocaml-index/gh10985/foo.ml

@@ -0,0 +1 @@
+let () = Test_lib.x

test/blackbox-tests/test-cases/ocaml-index/gh10985/run.t

@@ -0,0 +1,23 @@
+This test attempts to build the ocaml index while depending on a library
+installed through a lock file.
+
+This is based off of the pkg/libraries.t test, just taking advantage of
+being in its own directory.
+
+This can't be just written to disk, I /think/ so it cat get an absolute path
+in the source stanza.
+
+  $ cat >dune.lock/mypkg.pkg <<EOF
+  > (version 0.0.1)
+  > (source (copy $PWD/external_sources))
+  > (build (run dune build --release --promote-install-file=true . @install))
+  > EOF
+
+  $ dune build @ocaml-index
+  Error: This rule defines a directory target "default/.pkg/mypkg/target" that
+  matches the requested path
+  "default/.pkg/mypkg/target/lib/mypkg/lib/cctx.ocaml-index" but the rule's
+  action didn't produce it
+  -> required by _build/default/.foo.objs/cctx.ocaml-index
+  -> required by alias ocaml-index
+  [1]