From 62c224ffe4845ed3a1f651d05ea0be84d5c870ea Mon Sep 17 00:00:00 2001
From: Graydon Hoare <graydon@mozilla.com>
Date: Thu, 30 Sep 2010 16:10:30 -0700
Subject: Drop slots on block exits even when blocks have no statements. Part
 way to fixing bind leakage in rustc.

---
 src/boot/fe/ast.ml | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src/boot/fe')

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 "_"
-- 
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