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-rw-r--r--lib/kernel/mass_formulary.ml4
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/kernel/mass_formulary.ml b/lib/kernel/mass_formulary.ml
index cb3532b..60f9f1c 100644
--- a/lib/kernel/mass_formulary.ml
+++ b/lib/kernel/mass_formulary.ml
@@ -1,5 +1,7 @@
+open Sexplib0.Sexp_conv
+
type source = Proper | Own_slug | Preceding_sunday | Common | Votive [@@deriving sexp]
-type t = { said : Slug.t; via : source } [@@deriving sexp]
+type t = { said : Slug.t option; via : source } [@@deriving sexp]
let source_to_string = function
| Proper -> "proper"