Fix warnings

Author: antoyo

example/alloc_example.rs

@@ -18,16 +18,12 @@ extern "C" {
 
 #[panic_handler]
 fn panic_handler(_: &core::panic::PanicInfo) -> ! {
-    unsafe {
-        core::intrinsics::abort();
-    }
+    core::intrinsics::abort();
 }
 
 #[alloc_error_handler]
 fn alloc_error_handler(_: alloc::alloc::Layout) -> ! {
-    unsafe {
-        core::intrinsics::abort();
-    }
+    core::intrinsics::abort();
 }
 
 #[start]

example/mini_core_hello_world.rs

@@ -228,6 +228,7 @@ fn main() {
     } as Box<dyn SomeTrait>;
 
     const FUNC_REF: Option<fn()> = Some(main);
+    #[allow(unreachable_code)]
     match FUNC_REF {
         Some(_) => {},
         None => assert!(false),

example/mod_bench.rs

@@ -6,9 +6,7 @@ extern {}
 
 #[panic_handler]
 fn panic_handler(_: &core::panic::PanicInfo) -> ! {
-    unsafe {
-        core::intrinsics::abort();
-    }
+    core::intrinsics::abort();
 }
 
 #[lang="eh_personality"]
@@ -32,6 +30,6 @@ fn main(_argc: isize, _argv: *const *const u8) -> isize {
 #[inline(never)]
 fn black_box(i: u32) {
     if i != 1 {
-        unsafe { core::intrinsics::abort(); }
+        core::intrinsics::abort();
     }
 }

example/std_example.rs

@@ -1,5 +1,6 @@
 #![feature(core_intrinsics, generators, generator_trait, is_sorted)]
 
+#[cfg(feature="master")]
 use std::arch::x86_64::*;
 use std::io::Write;
 use std::ops::Generator;