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-rw-r--r--src/boot/fe/ast.ml1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/boot/fe/ast.ml b/src/boot/fe/ast.ml
index 46a87dfe..78b3ac51 100644
--- a/src/boot/fe/ast.ml
+++ b/src/boot/fe/ast.ml
@@ -1545,6 +1545,7 @@ and fmt_pat (ff:Format.formatter) (pat:pat) : unit =
fmt_lval ff ctor;
fmt_bracketed_arr_sep "(" ")" "," fmt_pat ff pats
| PAT_slot (_, ident) ->
+ fmt ff "?";
fmt_ident ff ident
| PAT_wild ->
fmt ff "_"