unikernel/duniverse/dune_/test/blackbox-tests/test-cases/watching/github5064.t

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+A test case for #5064: errors when changing module dependencies in the
+file-watching mode.
+
+  $ . ./helpers.sh
+
+  $ echo '(lang dune 3.0)' > dune-project
+  $ mkdir lib
+  $ cat > lib/dune <<EOF
+  > (library (name lib))
+  > EOF
+  $ cat > dune <<EOF
+  > (executable (name x) (libraries lib))
+  > EOF
+  $ echo 'let hello = "Hello"' > lib/a.ml
+  $ echo 'let world = "World"' > lib/b.ml
+  $ echo 'let message = A.hello ^ ", " ^ B.world' > lib/lib.ml
+
+  $ echo 'print_endline Lib.message' > x.ml
+
+  $ start_dune
+
+  $ build x.exe
+  Success
+  $ _build/default/x.exe
+  Hello, World
+
+Now let's make [lib/a.ml] depend on [lib/b.ml]. It doesn't work!
+
+  $ cat > lib/a.ml <<EOF
+  > let _ = B.world
+  > let hello = "Hello"
+  > EOF
+
+  $ build x.exe
+  Success
+
+Let's try a manual restart.
+
+  $ stop_dune
+  Success, waiting for filesystem changes...
+  Success, waiting for filesystem changes...
+
+  $ start_dune
+
+It works now!
+
+  $ build x.exe
+  Success
+
+We're done.
+
+  $ stop_dune
+  Success, waiting for filesystem changes...