rename to panic_handler as panic_implementation is deprecated in nightly

substrate/executor/wasm/src/lib.rs

@@ -1,5 +1,5 @@
 #![no_std]
-#![feature(panic_implementation)]
+#![feature(panic_handler)]
 #![cfg_attr(feature = "strict", deny(warnings))]
 
 #![feature(alloc)]

substrate/runtime-io/src/lib.rs

@@ -18,7 +18,7 @@
 
 #![cfg_attr(not(feature = "std"), no_std)]
 #![cfg_attr(not(feature = "std"), feature(lang_items))]
-#![cfg_attr(not(feature = "std"), feature(panic_implementation))]
+#![cfg_attr(not(feature = "std"), feature(panic_handler))]
 #![cfg_attr(not(feature = "std"), feature(alloc_error_handler))]
 #![cfg_attr(not(feature = "std"), feature(core_intrinsics))]
 #![cfg_attr(not(feature = "std"), feature(alloc))]

substrate/runtime-io/without_std.rs

@@ -27,7 +27,7 @@ use core::intrinsics;
 use rstd::vec::Vec;
 pub use rstd::{mem, slice};
 
-#[panic_implementation]
+#[panic_handler]
 #[no_mangle]
 pub fn panic(info: &::core::panic::PanicInfo) -> ! {
 	unsafe {

substrate/runtime-sandbox/src/lib.rs

@@ -37,7 +37,7 @@
 
 #![warn(missing_docs)]
 #![cfg_attr(not(feature = "std"), no_std)]
-#![cfg_attr(not(feature = "std"), feature(panic_implementation))]
+#![cfg_attr(not(feature = "std"), feature(panic_handler))]
 #![cfg_attr(not(feature = "std"), feature(core_intrinsics))]
 #![cfg_attr(not(feature = "std"), feature(alloc))]
 

substrate/runtime-std/src/lib.rs

@@ -18,7 +18,7 @@
 //! or core/alloc to be used with any code that depends on the runtime.
 
 #![cfg_attr(not(feature = "std"), no_std)]
-#![cfg_attr(not(feature = "std"), feature(panic_implementation))]
+#![cfg_attr(not(feature = "std"), feature(panic_handler))]
 #![cfg_attr(not(feature = "std"), feature(core_intrinsics))]
 #![cfg_attr(not(feature = "std"), feature(alloc))]