From 403a46abccbc03e70e7975d00a5134867a1d4fc7 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <superjoe30@gmail.com>
Date: Fri, 10 Nov 2017 16:03:14 -0500
Subject: [PATCH] fix test failure on 32 bit windows

---
 std/io.zig | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/std/io.zig b/std/io.zig
index 64946b28b4..d570927488 100644
--- a/std/io.zig
+++ b/std/io.zig
@@ -273,7 +273,9 @@ pub const File = struct {
                     else => os.unexpectedErrorWindows(err),
                 };
             }
-            return @bitCast(usize, file_size);
+            if (file_size < 0)
+                return error.Overflow;
+            return math.cast(usize, u64(file_size));
         } else {
             unreachable;
         }