From 5ceff6b96af9a21e044545b9e064433feccaf659 Mon Sep 17 00:00:00 2001
From: Nicholas Nethercote <nnethercote@mozilla.com>
Date: Thu, 21 May 2020 10:36:32 +1000
Subject: [PATCH] Fix off-by-one error in `DroplessArena::alloc_raw`.

This causes unnecessary calls to `grow` when the allocation would fit
exactly in the remaining space.
---
 src/librustc_arena/lib.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/librustc_arena/lib.rs b/src/librustc_arena/lib.rs
index bbe80c26dcbf9..725850036bbbf 100644
--- a/src/librustc_arena/lib.rs
+++ b/src/librustc_arena/lib.rs
@@ -386,7 +386,7 @@ impl DroplessArena {
             self.align(align);
 
             let future_end = intrinsics::arith_offset(self.ptr.get(), bytes as isize);
-            if (future_end as *mut u8) >= self.end.get() {
+            if (future_end as *mut u8) > self.end.get() {
                 self.grow(bytes);
             }