From 2fa60c5359a985d0a4dcd2dbefa8f9d3ddc8038a Mon Sep 17 00:00:00 2001
From: Nicholas Nethercote <nnethercote@mozilla.com>
Date: Wed, 21 Nov 2018 11:15:39 +1100
Subject: [PATCH 1/2] Add a new feature, `may_dangle`.

This commit adds a `may_dangle` annotation to `drop`, matching `Vec`.
This feature increases the ability of `SmallVec` to be used as a drop-in
replacement for `Vec`. A feature is necessary because `may_dangle` is
Nightly-only.

Fixes #132.
---
 Cargo.toml |  1 +
 lib.rs     | 16 ++++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/Cargo.toml b/Cargo.toml
index f2bef65..86fb21b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,6 +15,7 @@ std = []
 union = []
 default = ["std"]
 specialization = []
+may_dangle = []
 
 [lib]
 name = "smallvec"
diff --git a/lib.rs b/lib.rs
index d3699c0..74c4abf 100644
--- a/lib.rs
+++ b/lib.rs
@@ -32,6 +32,7 @@
 #![cfg_attr(not(feature = "std"), feature(alloc))]
 #![cfg_attr(feature = "union", feature(untagged_unions))]
 #![cfg_attr(feature = "specialization", feature(specialization))]
+#![cfg_attr(feature = "may_dangle", feature(dropck_eyepatch))]
 #![deny(missing_docs)]
 
 
@@ -1374,6 +1375,21 @@ impl<A: Array> Default for SmallVec<A> {
     }
 }
 
+#[cfg(feature = "may_dangle")]
+unsafe impl<#[may_dangle] A: Array> Drop for SmallVec<A> {
+    fn drop(&mut self) {
+        unsafe {
+            if self.spilled() {
+                let (ptr, len) = self.data.heap();
+                Vec::from_raw_parts(ptr, len, self.capacity);
+            } else {
+                ptr::drop_in_place(&mut self[..]);
+            }
+        }
+    }
+}
+
+#[cfg(not(feature = "may_dangle"))]
 impl<A: Array> Drop for SmallVec<A> {
     fn drop(&mut self) {
         unsafe {

From 72a500f6739cdf3596e96e128580e050b2350f55 Mon Sep 17 00:00:00 2001
From: Nicholas Nethercote <nnethercote@mozilla.com>
Date: Fri, 30 Nov 2018 08:36:14 +1100
Subject: [PATCH 2/2] Bump version number to 0.6.7.

---
 Cargo.toml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Cargo.toml b/Cargo.toml
index 86fb21b..1df6384 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "smallvec"
-version = "0.6.6"
+version = "0.6.7"
 authors = ["Simon Sapin <simon.sapin@exyr.org>"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/servo/rust-smallvec"