From 4c5f66ff4a0ad2714f835a0f6551e4080b1f690a Mon Sep 17 00:00:00 2001
From: Matthew Butterick <mbutterick@users.noreply.github.com>
Date: Tue, 30 May 2017 08:05:40 -0700
Subject: [PATCH] fix typo
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`that do` → `that does`
---
 racket/collects/ffi/unsafe.rkt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/racket/collects/ffi/unsafe.rkt b/racket/collects/ffi/unsafe.rkt
index ccacf7c2c1..aa843571cc 100644
--- a/racket/collects/ffi/unsafe.rkt
+++ b/racket/collects/ffi/unsafe.rkt
@@ -547,7 +547,7 @@
         ;; disappear from the inputs.
         (unless use-expr?
           (if (and (pair? no-expr?) (car no-expr?) expr)
-            (err "got an expression for a custom type that do not use it"
+            (err "got an expression for a custom type that does not use it"
                  clause)
             (set! expr (void))))
         (when use-expr?