driver.mld: Fix Mdx error hidden by Dune error

As the driver reports errors with promotion and not with an exit status, the driver could fail to generate `driver-benchmarks.json`, in which case Dune would complain about the missing target and would not show the diff containing the error.
ocaml · Nov 7, 2023 · dfefbcc · dfefbcc
1 parent 036ba73
commit dfefbcc
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/doc/dune b/doc/dune
@@ -37,7 +37,9 @@
   (glob_files library_mlds/*)
   (glob_files examples/*.ml*))
  (action
-  (run ocaml-mdx-test --force-output %{dep:driver.mld})))
+  (progn
+   (write-file driver-benchmarks.json "")
+   (run ocaml-mdx-test --force-output %{dep:driver.mld}))))
 
 (rule
  (alias docgen)