unikernel/duniverse/dune_/test/blackbox-tests/test-cases/melange/nested-melange-emit-stanzas.t

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+Make sure an error is returned if trying to nest `melange.emit` stanzas
+
+  $ cat > dune-project <<EOF
+  > (lang dune 3.8)
+  > (using melange 0.1)
+  > EOF
+  $ mkdir -p a/output/b
+  $ cat > a/dune <<EOF
+  > (melange.emit
+  >  (target output)
+  >  (alias mel)
+  >  (emit_stdlib false)
+  >  (module_systems commonjs))
+  > EOF
+  $ cat > a/output/b/dune <<EOF
+  > (melange.emit
+  >  (target output)
+  >  (alias mel)
+  >  (emit_stdlib false)
+  >  (module_systems commonjs))
+  > EOF
+
+  $ dune build @mel
+  File "a/output/b/dune", lines 1-5, characters 0-92:
+  1 | (melange.emit
+  2 |  (target output)
+  3 |  (alias mel)
+  4 |  (emit_stdlib false)
+  5 |  (module_systems commonjs))
+  Error: melange.emit stanzas cannot be nested
+  - a/dune:1
+  - a/output/b/dune:1
+  Hint: Move both `melange.emit' stanzas to the same level.
+  [1]