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

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+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]