attempt to fix wasm const fn

Author: RalfJung

crates/core_arch/src/lib.rs

@@ -37,7 +37,8 @@
     sha512_sm_x86,
     x86_amx_intrinsics,
     f16,
-    rustc_allow_const_fn_unstable
+    rustc_allow_const_fn_unstable,
+    wasm_simd_const_internals
 )]
 #![cfg_attr(test, feature(test, abi_vectorcall, stdarch_internal))]
 #![deny(clippy::missing_inline_in_public_items)]
@@ -73,10 +74,6 @@
         stdarch_loongarch_feature_detection
     )
 )]
-#![cfg_attr(
-    any(target_arch = "wasm32", target_arch = "wasm64", doc),
-    feature(wasm_simd_const_internals)
-)]
 
 #[cfg(test)]
 #[macro_use]

crates/core_arch/src/simd.rs

@@ -11,6 +11,7 @@ macro_rules! simd_ty {
         #[allow(clippy::use_self)]
         impl $id {
             #[inline(always)]
+            #[rustc_const_unstable(feature = "wasm_simd_const_internals", issue = "none")] // FIXME remove when const-stability v2 migration is done
             pub(crate) const fn new($($param_name: $elem_type),*) -> Self {
                 $id([$($param_name),*])
             }
@@ -52,11 +53,13 @@ macro_rules! simd_m_ty {
         #[allow(clippy::use_self)]
         impl $id {
             #[inline(always)]
+            #[rustc_const_unstable(feature = "wasm_simd_const_internals", issue = "none")] // FIXME remove when const-stability v2 migration is done
             const fn bool_to_internal(x: bool) -> $elem_type {
                 [0 as $elem_type, !(0 as $elem_type)][x as usize]
             }
 
             #[inline(always)]
+            #[rustc_const_unstable(feature = "wasm_simd_const_internals", issue = "none")] // FIXME remove when const-stability v2 migration is done
             pub(crate) const fn new($($param_name: bool),*) -> Self {
                 $id([$(Self::bool_to_internal($param_name)),*])
             }