Add ex-10 from traces #12344

Job	Run time
gobview (ubuntu-22.04, ocaml-variants.4.14.2+options,ocaml-option-flambda, 14)	7m 30s
regression (ubuntu-22.04, ocaml-variants.4.14.2+options,ocaml-option-flambda)	8m 13s
regression (macos-13, ocaml-variants.4.14.2+options,ocaml-option-flambda)	21m 6s
extraction	0s
	36m 49s

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