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

@@ -0,0 +1,47 @@
+Fallback rules must either have:
+
+* all their targets in the source
+* no targets in the source
+
+Here we me makes sure that having some targets in the source and some not is
+impossible.
+
+  $ cat>dune-project <<EOF
+  > (lang dune 3.10)
+  > EOF
+
+  $ cat >dune <<EOF
+  > (rule
+  >  (action
+  >   (progn
+  >    (with-stdout-to x (echo ""))
+  >    (with-stdout-to y (echo ""))))
+  >  (mode fallback)
+  >  (targets x y))
+  > EOF
+
+  $ build() { dune build x y; }
+
+  $ build
+
+  $ touch x
+
+  $ build
+  File "dune", lines 1-7, characters 0-122:
+  1 | (rule
+  2 |  (action
+  3 |   (progn
+  4 |    (with-stdout-to x (echo ""))
+  5 |    (with-stdout-to y (echo ""))))
+  6 |  (mode fallback)
+  7 |  (targets x y))
+  Error: Some of the targets of this fallback rule are present in the source
+  tree, and some are not. This is not allowed. Either none of the targets must
+  be present in the source tree, either they must all be.
+  
+  The following targets are present:
+  - x
+  
+  The following targets are not:
+  - y
+  [1]