librustc: Put `#[unsafe_destructor]` behind a feature gate.

Closes #8142.

This is not the semantics we want long-term. You can continue to use
`#[unsafe_destructor]`, but you'll need to add
`#![feature(unsafe_destructor)]` to the crate attributes.

[breaking-change]

22 files changed, 28 insertions, 16 deletions

diff --git a/src/test/auxiliary/issue-2526.rs b/src/test/auxiliary/issue-2526.rs
index 8d096a9b7e7..c6ca0f3ed7b 100644
--- a/src/test/auxiliary/issue-2526.rs
+++ b/src/test/auxiliary/issue-2526.rs
@@ -11,6 +11,8 @@
 #![crate_id="issue_2526#0.2"]
 #![crate_type = "lib"]
 
+#![feature(unsafe_destructor)]
+
 struct arc_destruct<T> {
   _data: int,
 }
diff --git a/src/test/bench/task-perf-alloc-unwind.rs b/src/test/bench/task-perf-alloc-unwind.rs
index 037a326880f..a3d78823816 100644
--- a/src/test/bench/task-perf-alloc-unwind.rs
+++ b/src/test/bench/task-perf-alloc-unwind.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(managed_boxes)]
+#![feature(managed_boxes, unsafe_destructor)]
 
 extern crate collections;
 extern crate time;
diff --git a/src/test/compile-fail/borrowck-borrowed-uniq-rvalue-2.rs b/src/test/compile-fail/borrowck-borrowed-uniq-rvalue-2.rs
index 6f385a8d1eb..081dc61d9fc 100644
--- a/src/test/compile-fail/borrowck-borrowed-uniq-rvalue-2.rs
+++ b/src/test/compile-fail/borrowck-borrowed-uniq-rvalue-2.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![feature(unsafe_destructor)]
+
 extern crate debug;
 
 struct defer<'a> {
diff --git a/src/test/compile-fail/no-send-res-ports.rs b/src/test/compile-fail/no-send-res-ports.rs
index 20edd175560..c086f44d08b 100644
--- a/src/test/compile-fail/no-send-res-ports.rs
+++ b/src/test/compile-fail/no-send-res-ports.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(managed_boxes)]
+#![feature(managed_boxes, unsafe_destructor)]
 
 extern crate debug;
 
diff --git a/src/test/compile-fail/pinned-deep-copy.rs b/src/test/compile-fail/pinned-deep-copy.rs
index aaa09de826b..d6e8507d020 100644
--- a/src/test/compile-fail/pinned-deep-copy.rs
+++ b/src/test/compile-fail/pinned-deep-copy.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(managed_boxes)]
+#![feature(managed_boxes, unsafe_destructor)]
 
 extern crate debug;
 
diff --git a/src/test/compile-fail/unique-vec-res.rs b/src/test/compile-fail/unique-vec-res.rs
index 4d10537aa4d..a2adb55a2dd 100644
--- a/src/test/compile-fail/unique-vec-res.rs
+++ b/src/test/compile-fail/unique-vec-res.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(managed_boxes)]
+#![feature(managed_boxes, unsafe_destructor)]
 
 extern crate debug;
 use std::cell::Cell;
diff --git a/src/test/run-fail/unwind-resource-fail3.rs b/src/test/run-fail/unwind-resource-fail3.rs
index 6252944973d..8186c6263ca 100644
--- a/src/test/run-fail/unwind-resource-fail3.rs
+++ b/src/test/run-fail/unwind-resource-fail3.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(managed_boxes)]
+#![feature(managed_boxes, unsafe_destructor)]
 
 // error-pattern:quux
 
diff --git a/src/test/run-pass/attr-no-drop-flag-size.rs b/src/test/run-pass/attr-no-drop-flag-size.rs
index 48768a1c6fd..b3fb1627900 100644
--- a/src/test/run-pass/attr-no-drop-flag-size.rs
+++ b/src/test/run-pass/attr-no-drop-flag-size.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![feature(unsafe_destructor)]
+
 use std::mem::size_of;
 
 #[unsafe_no_drop_flag]
diff --git a/src/test/run-pass/drop-trait-generic.rs b/src/test/run-pass/drop-trait-generic.rs
index 977bd474d17..4ba3aa70dfc 100644
--- a/src/test/run-pass/drop-trait-generic.rs
+++ b/src/test/run-pass/drop-trait-generic.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![feature(unsafe_destructor)]
+
 struct S<T> {
     x: T
 }
diff --git a/src/test/run-pass/init-res-into-things.rs b/src/test/run-pass/init-res-into-things.rs
index 4c05103973f..5e0aeeb6bed 100644
--- a/src/test/run-pass/init-res-into-things.rs
+++ b/src/test/run-pass/init-res-into-things.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(managed_boxes)]
+#![feature(managed_boxes, unsafe_destructor)]
 
 use std::cell::Cell;
 use std::gc::{Gc, GC};
diff --git a/src/test/run-pass/issue-2718.rs b/src/test/run-pass/issue-2718.rs
index 5f180f13ffa..5eb9453134d 100644
--- a/src/test/run-pass/issue-2718.rs
+++ b/src/test/run-pass/issue-2718.rs
@@ -9,6 +9,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![feature(unsafe_destructor)]
+
 pub type Task = int;
 
 // tjc: I don't know why
diff --git a/src/test/run-pass/issue-2735-2.rs b/src/test/run-pass/issue-2735-2.rs
index b62905634ad..744ab45adc4 100644
--- a/src/test/run-pass/issue-2735-2.rs
+++ b/src/test/run-pass/issue-2735-2.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(managed_boxes)]
+#![feature(managed_boxes, unsafe_destructor)]
 
 use std::cell::Cell;
 use std::gc::{Gc, GC};
diff --git a/src/test/run-pass/issue-2735-3.rs b/src/test/run-pass/issue-2735-3.rs
index f59c143c46f..a69ec1dac72 100644
--- a/src/test/run-pass/issue-2735-3.rs
+++ b/src/test/run-pass/issue-2735-3.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(managed_boxes)]
+#![feature(managed_boxes, unsafe_destructor)]
 
 use std::cell::Cell;
 use std::gc::{Gc, GC};
diff --git a/src/test/run-pass/issue-4252.rs b/src/test/run-pass/issue-4252.rs
index 151d00eb2d0..186dd0363ee 100644
--- a/src/test/run-pass/issue-4252.rs
+++ b/src/test/run-pass/issue-4252.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![feature(unsafe_destructor)]
+
 extern crate debug;
 
 trait X {
diff --git a/src/test/run-pass/issue-979.rs b/src/test/run-pass/issue-979.rs
index 39b81d16519..fc29299a4a9 100644
--- a/src/test/run-pass/issue-979.rs
+++ b/src/test/run-pass/issue-979.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(managed_boxes)]
+#![feature(managed_boxes, unsafe_destructor)]
 
 use std::cell::Cell;
 use std::gc::{GC, Gc};
diff --git a/src/test/run-pass/newtype-struct-drop-run.rs b/src/test/run-pass/newtype-struct-drop-run.rs
index 3821efcb1bc..efa151c6606 100644
--- a/src/test/run-pass/newtype-struct-drop-run.rs
+++ b/src/test/run-pass/newtype-struct-drop-run.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(managed_boxes)]
+#![feature(managed_boxes, unsafe_destructor)]
 
 // Make sure the destructor is run for newtype structs.
 
diff --git a/src/test/run-pass/option-unwrap.rs b/src/test/run-pass/option-unwrap.rs
index eea5296d7e4..e9df731fbbf 100644
--- a/src/test/run-pass/option-unwrap.rs
+++ b/src/test/run-pass/option-unwrap.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(managed_boxes)]
+#![feature(managed_boxes, unsafe_destructor)]
 
 use std::cell::Cell;
 use std::gc::{GC, Gc};
diff --git a/src/test/run-pass/resource-assign-is-not-copy.rs b/src/test/run-pass/resource-assign-is-not-copy.rs
index 7f266ec912a..dc6dac15bb2 100644
--- a/src/test/run-pass/resource-assign-is-not-copy.rs
+++ b/src/test/run-pass/resource-assign-is-not-copy.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(managed_boxes)]
+#![feature(managed_boxes, unsafe_destructor)]
 
 extern crate debug;
 
diff --git a/src/test/run-pass/resource-destruct.rs b/src/test/run-pass/resource-destruct.rs
index 85750899259..60526faef50 100644
--- a/src/test/run-pass/resource-destruct.rs
+++ b/src/test/run-pass/resource-destruct.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(managed_boxes)]
+#![feature(managed_boxes, unsafe_destructor)]
 
 use std::cell::Cell;
 use std::gc::{GC, Gc};
diff --git a/src/test/run-pass/resource-in-struct.rs b/src/test/run-pass/resource-in-struct.rs
index 88edefdfe29..253a2c0c712 100644
--- a/src/test/run-pass/resource-in-struct.rs
+++ b/src/test/run-pass/resource-in-struct.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(managed_boxes)]
+#![feature(managed_boxes, unsafe_destructor)]
 
 // Ensures that class dtors run if the object is inside an enum
 // variant
diff --git a/src/test/run-pass/unwind-resource2.rs b/src/test/run-pass/unwind-resource2.rs
index b1669dea7b2..2739b898f9f 100644
--- a/src/test/run-pass/unwind-resource2.rs
+++ b/src/test/run-pass/unwind-resource2.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(managed_boxes)]
+#![feature(managed_boxes, unsafe_destructor)]
 
 use std::task;
 use std::gc::{Gc, GC};
diff --git a/src/test/run-pass/vec-slice-drop.rs b/src/test/run-pass/vec-slice-drop.rs
index 3c0a9abec14..9e5fc6d0518 100644
--- a/src/test/run-pass/vec-slice-drop.rs
+++ b/src/test/run-pass/vec-slice-drop.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(managed_boxes)]
+#![feature(managed_boxes, unsafe_destructor)]
 
 use std::cell::Cell;
 use std::gc::{Gc, GC};