Auto merge of #18579 - mbrubeck:features, r=KiChjang

Remove unused feature gates

CC #5286.

---
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes do not require tests because no code changes

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---
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components/gfx/lib.rs

@@ -7,7 +7,6 @@
 #![feature(box_syntax)]
 #![feature(cfg_target_feature)]
 #![feature(range_contains)]
-#![feature(unique)]
 
 #![deny(unsafe_code)]
 

components/gfx/text/shaping/harfbuzz.rs

@@ -164,7 +164,7 @@ impl Shaper {
                               Shaper::float_to_fixed(pt_size) as c_int);
 
             // configure static function callbacks.
-            hb_font_set_funcs(hb_font, HB_FONT_FUNCS.as_ptr(), font as *mut Font as *mut c_void, None);
+            hb_font_set_funcs(hb_font, HB_FONT_FUNCS.0, font as *mut Font as *mut c_void, None);
 
             Shaper {
                 hb_face: hb_face,
@@ -411,9 +411,13 @@ impl Shaper {
     }
 }
 
-// Callbacks from Harfbuzz when font map and glyph advance lookup needed.
+/// Callbacks from Harfbuzz when font map and glyph advance lookup needed.
+struct FontFuncs(*mut hb_font_funcs_t);
+
+unsafe impl Sync for FontFuncs {}
+
 lazy_static! {
-    static ref HB_FONT_FUNCS: ptr::Unique<hb_font_funcs_t> = unsafe {
+    static ref HB_FONT_FUNCS: FontFuncs = unsafe {
         let hb_funcs = hb_font_funcs_create();
         hb_font_funcs_set_glyph_func(hb_funcs, Some(glyph_func), ptr::null_mut(), None);
         hb_font_funcs_set_glyph_h_advance_func(
@@ -421,7 +425,7 @@ lazy_static! {
         hb_font_funcs_set_glyph_h_kerning_func(
             hb_funcs, Some(glyph_h_kerning_func), ptr::null_mut(), None);
 
-        ptr::Unique::new_unchecked(hb_funcs)
+        FontFuncs(hb_funcs)
     };
 }
 

components/script/lib.rs

@@ -14,9 +14,7 @@
 #![feature(on_unimplemented)]
 #![feature(plugin)]
 #![feature(proc_macro)]
-#![feature(stmt_expr_attributes)]
 #![feature(try_from)]
-#![feature(unboxed_closures)]
 #![feature(untagged_unions)]
 
 #![deny(unsafe_code)]

components/script_plugins/lib.rs

@@ -15,7 +15,10 @@
 
 
 #![deny(unsafe_code)]
-#![feature(box_syntax, plugin, plugin_registrar, rustc_private)]
+#![feature(box_syntax)]
+#![feature(plugin)]
+#![feature(plugin_registrar)]
+#![feature(rustc_private)]
 
 #[macro_use]
 extern crate rustc;

ports/servo/main.rs

@@ -15,7 +15,7 @@
 //!
 //! [glutin]: https://github.com/tomaka/glutin
 
-#![feature(start, core_intrinsics)]
+#![feature(core_intrinsics)]
 
 #[cfg(target_os = "android")]
 extern crate android_injected_glue;