Remove default-except-unstable

… and use remaining unstable features unconditionally.
This doesn’t actually change the set of crates that can build on the Stable channel.

components/script/Cargo.toml

@@ -15,7 +15,6 @@ path = "lib.rs"
 [features]
 debugmozjs = ['js/debugmozjs']
 profilemozjs = ['js/profilemozjs']
-unstable = []
 unrooted_must_root_lint = ["script_plugins/unrooted_must_root_lint"]
 webidl_lint = ["script_plugins/webidl_lint"]
 default = ["unrooted_must_root_lint", "webidl_lint"]

components/script/dom/bindings/conversions.rs

@@ -69,10 +69,7 @@ pub trait IDLInterface {
 }
 
 /// A trait to mark an IDL interface as deriving from another one.
-#[cfg_attr(
-    feature = "unstable",
-    rustc_on_unimplemented(message = "The IDL interface `{Self}` is not derived from `{T}`.")
-)]
+#[rustc_on_unimplemented(message = "The IDL interface `{Self}` is not derived from `{T}`.")]
 pub trait DerivedFrom<T: Castable>: Castable {}
 
 impl<T: Float + ToJSValConvertible> ToJSValConvertible for Finite<T> {

components/script/dom/bindings/root.rs

@@ -330,13 +330,13 @@ impl<T: DomObject> Deref for Dom<T> {
 
 unsafe impl<T: DomObject> JSTraceable for Dom<T> {
     unsafe fn trace(&self, trc: *mut JSTracer) {
-        #[cfg(all(feature = "unstable", debug_assertions))]
-        let trace_str = format!("for {} on heap", ::std::intrinsics::type_name::<T>());
-        #[cfg(all(feature = "unstable", debug_assertions))]
-        let trace_info = &trace_str[..];
-        #[cfg(not(all(feature = "unstable", debug_assertions)))]
-        let trace_info = "for DOM object on heap";
-
+        let trace_string;
+        let trace_info = if cfg!(debug_assertions) {
+            trace_string = format!("for {} on heap", ::std::intrinsics::type_name::<T>());
+            &trace_string[..]
+        } else {
+            "for DOM object on heap"
+        };
         trace_reflector(trc, trace_info, (*self.ptr.as_ptr()).reflector());
     }
 }

components/script/dom/window.rs

@@ -938,10 +938,7 @@ impl WindowMethods for Window {
 
     #[allow(unsafe_code)]
     fn Trap(&self) {
-        #[cfg(feature = "unstable")]
-        unsafe {
-            ::std::intrinsics::breakpoint()
-        }
+        unsafe { ::std::intrinsics::breakpoint() }
     }
 
     #[allow(unsafe_code)]

components/script/lib.rs

@@ -2,11 +2,11 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-#![cfg_attr(feature = "unstable", feature(core_intrinsics))]
-#![cfg_attr(feature = "unstable", feature(on_unimplemented))]
 #![feature(const_fn)]
+#![feature(core_intrinsics)]
 #![feature(drain_filter)]
 #![feature(inner_deref)]
+#![feature(on_unimplemented)]
 #![feature(plugin)]
 #![feature(type_alias_enum_variants)]
 #![deny(unsafe_code)]

components/script/task.rs

@@ -32,14 +32,7 @@ macro_rules! task {
 pub trait TaskOnce: Send {
     #[allow(unsafe_code)]
     fn name(&self) -> &'static str {
-        #[cfg(feature = "unstable")]
-        unsafe {
-            ::std::intrinsics::type_name::<Self>()
-        }
-        #[cfg(not(feature = "unstable"))]
-        {
-            "(task name unknown)"
-        }
+        unsafe { ::std::intrinsics::type_name::<Self>() }
     }
 
     fn run_once(self);