https://git.ruby-lang.org/ruby.git/commit/?id=026ba68c10

From 026ba68c1056fb6729868456fba3382f8b9a0fcf Mon Sep 17 00:00:00 2001
From: Samuel Williams <samuel.williams@o...>
Date: Tue, 15 Sep 2020 18:50:42 +1200
Subject: Fix handling of FMODE_PREP.


diff --git a/io.c b/io.c
index e5fac3c..b615aca 100644
--- a/io.c
+++ b/io.c
@@ -1306,7 +1306,7 @@ rb_io_from_fd(int f) https://github.com/ruby/ruby/blob/trunk/io.c#L1306
     rb_io_t *fptr;
     RB_IO_POINTER(io, fptr);
 
-    fptr->mode &= ~FMODE_PREP;
+    fptr->mode |= FMODE_PREP;
 
     return io;
 }
-- 
cgit v0.10.2


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