Clean up code a bit:

 * Remove "bool_to_options" feature
 * Update version for compiler feature
 * rustfmt

Author: GuillaumeGomez

alloc/src/lib.rs

@@ -65,9 +65,10 @@
 #![doc(
     html_playground_url = "https://play.rust-lang.org/",
     issue_tracker_base_url = "https://github.com/rust-lang/rust/issues/",
-    test(no_crate_inject, attr(allow(unused_variables), deny(warnings))),
+    test(no_crate_inject, attr(allow(unused_variables), deny(warnings)))
 )]
-#![cfg_attr(not(bootstrap),
+#![cfg_attr(
+    not(bootstrap),
     doc(cfg_hide(not(test), not(any(test, bootstrap)), target_has_atomic = "ptr"))
 )]
 #![no_std]

core/src/lib.rs

@@ -58,9 +58,10 @@
     html_playground_url = "https://play.rust-lang.org/",
     issue_tracker_base_url = "https://github.com/rust-lang/rust/issues/",
     test(no_crate_inject, attr(deny(warnings))),
-    test(attr(allow(dead_code, deprecated, unused_variables, unused_mut))),
+    test(attr(allow(dead_code, deprecated, unused_variables, unused_mut)))
 )]
-#![cfg_attr(not(bootstrap),
+#![cfg_attr(
+    not(bootstrap),
     doc(cfg_hide(
         not(test),
         target_pointer_width = "16",

std/src/lib.rs

@@ -193,11 +193,9 @@
     html_playground_url = "https://play.rust-lang.org/",
     issue_tracker_base_url = "https://github.com/rust-lang/rust/issues/",
     test(no_crate_inject, attr(deny(warnings))),
-    test(attr(allow(dead_code, deprecated, unused_variables, unused_mut))),
-)]
-#![cfg_attr(not(bootstrap),
-    doc(cfg_hide(not(test), not(any(test, bootstrap))))
+    test(attr(allow(dead_code, deprecated, unused_variables, unused_mut)))
 )]
+#![cfg_attr(not(bootstrap), doc(cfg_hide(not(test), not(any(test, bootstrap)))))]
 // Don't link to std. We are std.
 #![no_std]
 #![warn(deprecated_in_future)]