unikernel/duniverse/dune_/doc/reference/actions/diffq.rst

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+diff?
+-----
+
+.. highlight:: dune
+
+.. describe:: (diff? <file1> <file2>)
+
+   ``(diff? <file1> <file2>)`` is similar to ``(diff <file1> <file2>)`` except
+   that ``<file2>`` should be produced by a part of the same action rather than
+   be a dependency, is optional and will be consumed by ``diff?``.
+
+   Example::
+
+     (progn
+      (with-stdout-to test.output (run ./test.exe))
+      (diff? test.expected test.output))