Add test for labeled tuples

Author: Octachron

test/passing/gen/dune.inc

@@ -3434,6 +3434,24 @@
  (package ocamlformat)
  (action (diff label_option_default_args.ml.err label_option_default_args.ml.stderr)))
 
+(rule
+ (deps .ocamlformat)
+ (package ocamlformat)
+ (action
+  (with-stdout-to labeled_tuples.ml.stdout
+   (with-stderr-to labeled_tuples.ml.stderr
+     (run %{bin:ocamlformat} --name labeled_tuples.ml --margin-check %{dep:../tests/labeled_tuples.ml})))))
+
+(rule
+ (alias runtest)
+ (package ocamlformat)
+ (action (diff labeled_tuples.ml.ref labeled_tuples.ml.stdout)))
+
+(rule
+ (alias runtest)
+ (package ocamlformat)
+ (action (diff labeled_tuples.ml.err labeled_tuples.ml.stderr)))
+
 (rule
  (deps .ocamlformat)
  (package ocamlformat)