unikernel/duniverse/dune_/test/blackbox-tests/test-cases/github2061.t/a

@@ -0,0 +1 @@
+SOURCE

unikernel/duniverse/dune_/test/blackbox-tests/test-cases/github2061.t/dune

@@ -0,0 +1,4 @@
+(rule
+ (progn
+  (with-stdout-to a (echo "GENERATED"))
+  (with-stdout-to b (echo "GENERATED"))))

unikernel/duniverse/dune_/test/blackbox-tests/test-cases/github2061.t/run.t

@@ -0,0 +1,14 @@
+Reproduction case for #2061. Make sure dune errors out when a rule in
+standard mode produces multiple files and only a strict subset of them
+is in the source tree.
+
+Before Dune 2.0, Dune was trying to be clever. However, this was more
+confusing than anything.
+
+  $ echo '(lang dune 1.10)' > dune-project
+  $ dune build a
+  Error: Multiple rules generated for _build/default/a:
+  - dune:1
+  - file present in source tree
+  Hint: rm -f a
+  [1]