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-rw-r--r--lib/ocaml_rts/linksem/src_lem_library/sum.ml4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/ocaml_rts/linksem/src_lem_library/sum.ml b/lib/ocaml_rts/linksem/src_lem_library/sum.ml
new file mode 100644
index 00000000..a9ea35ae
--- /dev/null
+++ b/lib/ocaml_rts/linksem/src_lem_library/sum.ml
@@ -0,0 +1,4 @@
+type ('a, 'b) sum =
+ | Inl of ('a)
+ | Inr of ('b)
+