refactor: remove #![feature(asm_sym)]

The `asm_sym` feature was stabilized by [rust-lang/rust#103168][1].

[1]: rust-lang/rust#103168

Author: yvt

README.md

@@ -59,7 +59,6 @@ The R3 original kernel is provided as a separate package [`r3_kernel`][].
 #![feature(naked_functions)]
 #![feature(const_mut_refs)]
 #![feature(asm_const)]
-#![feature(asm_sym)]
 #![no_std]
 #![no_main]
 

examples/basic_gr_peach/src/main.rs

@@ -3,7 +3,6 @@
 #![feature(const_mut_refs)]
 #![feature(naked_functions)]
 #![feature(asm_const)]
-#![feature(asm_sym)]
 #![deny(unsafe_op_in_unsafe_fn)]
 #![no_std]
 #![no_main]

examples/basic_nucleo_f401re/src/main.rs

@@ -3,7 +3,6 @@
 #![feature(naked_functions)]
 #![feature(const_mut_refs)]
 #![feature(asm_const)]
-#![feature(asm_sym)]
 #![deny(unsafe_op_in_unsafe_fn)]
 #![no_std]
 #![no_main]

examples/basic_rp_pico/src/main.rs

@@ -3,7 +3,6 @@
 #![feature(naked_functions)]
 #![feature(const_mut_refs)]
 #![feature(asm_const)]
-#![feature(asm_sym)]
 #![deny(unsafe_op_in_unsafe_fn)]
 #![no_std]
 #![no_main]

examples/basic_wio_terminal/src/main.rs

@@ -5,7 +5,6 @@
 #![feature(const_mut_refs)]
 #![feature(asm_const)]
 #![feature(let_else)]
-#![feature(asm_sym)]
 #![deny(unsafe_op_in_unsafe_fn)]
 #![no_std]
 #![no_main]

examples/smp_rp_pico/src/main.rs

@@ -4,7 +4,6 @@
 #![feature(naked_functions)]
 #![feature(const_mut_refs)]
 #![feature(asm_const)]
-#![feature(asm_sym)]
 #![deny(unsafe_op_in_unsafe_fn)]
 #![no_std]
 #![no_main]

src/r3_port_arm/src/lib.rs

@@ -8,7 +8,6 @@
 #![feature(lint_reasons)]
 #![feature(decl_macro)]
 #![feature(asm_const)]
-#![feature(asm_sym)]
 #![deny(unsafe_op_in_unsafe_fn)]
 #![allow(clippy::verbose_bit_mask)] // questionable
 #![cfg_attr(

src/r3_port_arm_m/src/lib.rs

@@ -7,7 +7,6 @@
 #![feature(slice_ptr_len)]
 #![feature(decl_macro)]
 #![feature(asm_const)]
-#![feature(asm_sym)]
 #![deny(unsafe_op_in_unsafe_fn)]
 #![cfg_attr(
     feature = "doc",

src/r3_port_arm_m_test_driver/src/main.rs

@@ -3,7 +3,6 @@
 #![feature(naked_functions)]
 #![feature(const_mut_refs)]
 #![feature(asm_const)]
-#![feature(asm_sym)]
 #![deny(unsafe_op_in_unsafe_fn)]
 #![cfg_attr(feature = "run", no_std)]
 #![cfg_attr(feature = "run", no_main)]

src/r3_port_arm_test_driver/src/main.rs

@@ -8,7 +8,6 @@
 #![feature(naked_functions)]
 #![feature(const_mut_refs)]
 #![feature(asm_const)]
-#![feature(asm_sym)]
 #![deny(unsafe_op_in_unsafe_fn)]
 #![cfg_attr(feature = "run", no_std)]
 #![cfg_attr(feature = "run", no_main)]

src/r3_port_riscv/src/lib.rs

@@ -8,7 +8,6 @@
 #![feature(decl_macro)]
 #![feature(raw_ref_op)]
 #![feature(asm_const)]
-#![feature(asm_sym)]
 #![feature(doc_cfg)]
 #![feature(linkage)]
 #![deny(unsafe_op_in_unsafe_fn)]

src/r3_port_riscv_test_driver/src/main.rs

@@ -4,7 +4,6 @@
 #![feature(const_mut_refs)]
 #![feature(decl_macro)]
 #![feature(asm_const)]
-#![feature(asm_sym)]
 #![deny(unsafe_op_in_unsafe_fn)]
 #![cfg_attr(feature = "run", no_std)]
 #![cfg_attr(feature = "run", no_main)]

src/r3_portkit/src/lib.rs

@@ -6,7 +6,6 @@
 #![feature(decl_macro)]
 #![feature(asm_const)]
 #![feature(const_cmp)]
-#![feature(asm_sym)]
 #![cfg_attr(
     feature = "doc",
     doc(html_logo_url = "https://r3-os.github.io/r3/logo-small.svg")

src/r3_portkit/src/sym.rs

@@ -27,7 +27,6 @@ pub use core::{arch::asm, mem};
 /// ```
 /// #![feature(naked_functions)]
 /// #![feature(asm_const)]
-/// #![feature(asm_sym)]
 /// use r3_portkit::sym::sym_static;
 /// use std::{arch::asm, cell::Cell};
 ///