unikernel/duniverse/dune_/test/blackbox-tests/test-cases/include-qualified/group-module-overlap.t

@@ -0,0 +1,39 @@
+When (include_subdirs qualified) is enabled, we should forbid the same module
+to be defined by both a normal compilation unit and a directory of modules
+
+  $ cat >dune-project <<EOF
+  > (lang dune 3.7)
+  > EOF
+  $ cat >dune <<EOF
+  > (include_subdirs qualified)
+  > (executable
+  >  (name foo))
+  > EOF
+
+  $ cat >foo.ml <<EOF
+  > module X = Mod
+  > EOF
+  $ touch mod.ml
+  $ mkdir mod
+  $ touch mod/baz.ml
+
+  $ dune build foo.exe
+  File "dune", line 1, characters 0-0:
+  Error: The following module and module group cannot co-exist in the same
+  executable or library because they correspond to the same module path
+  - module mod.ml
+  - module group mod/
+  [1]
+
+Another type of overlap:
+
+  $ rm mod/baz.ml
+  $ touch mod/mod.ml
+
+  $ dune build foo.exe
+  File "dune", line 1, characters 0-0:
+  Error: The following module and module group cannot co-exist in the same
+  executable or library because they correspond to the same module path
+  - module mod.ml
+  - module group mod/
+  [1]