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-rw-r--r--doc/tools/docgram/doc_grammar.ml5
1 files changed, 5 insertions, 0 deletions
diff --git a/doc/tools/docgram/doc_grammar.ml b/doc/tools/docgram/doc_grammar.ml
index 96eaff2895..548ca7364c 100644
--- a/doc/tools/docgram/doc_grammar.ml
+++ b/doc/tools/docgram/doc_grammar.ml
@@ -309,6 +309,11 @@ let rec output_prodn = function
| "{|" -> "%{%|"
| "`{" -> "`%{"
| "@{" -> "@%{"
+ | "|-" -> "%|-"
+ | "|->" -> "%|->"
+ | "||" -> "%||"
+ | "|||" -> "%|||"
+ | "||||" -> "%||||"
| "{"
| "}"
| "|" -> "%" ^ s