build

Source maps: avoid some code duplication #355

Job	Run time
lint-fmt	6m 52s
build (ubuntu-latest, 4.08, true, true, true)	4m 28s
build (ubuntu-latest, 4.09, true, true, true)	9m 32s
lint-opam	15m 54s
build (ubuntu-latest, 4.10, true, true, true)	7m 37s
build (ubuntu-latest, 4.11, true, true, true)	9m 35s
lint-runtime	5s
build (ubuntu-latest, 4.12, true, true, true)	7m 43s
build (ubuntu-latest, 4.13, true, true, true)	7m 44s
build (ubuntu-latest, 5.0, true, true, true)	8m 4s
build (ubuntu-latest, 5.1, true, true, true)	7m 34s
build (ubuntu-latest, 4.14, true, false, true)	19m 7s
build (ubuntu-latest, ocaml-variants.4.14.2+options,ocaml-option-32bit, true, false, true)	19m 2s
build (macos-latest, 4.14, true, false, true)	13m 24s
build (windows-latest, 4.14, true, false, true)	29m 18s
build (ubuntu-latest, 5.2, false, false, false)	22m 33s
build (ubuntu-latest, ocaml-variants.5.2.0+options,ocaml-option-32bit, true, true, true)	11m 43s
build (macos-latest, 5.2, true, false, true)	18m 57s
build (windows-latest, 5.2, false, false, true)	42m 57s
	4h 22m 9s

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