Always use an unsafe block to unsafe_main_ptr.

CHANGELOG.md

@@ -1,5 +1,7 @@
 ## Unreleased
 
+- Always use an `unsafe` block to `unsafe_main_ptr`. ([#643](https://github.com/fastly/Viceroy/pull/643))
+
 ## 0.19.0 (2026-06-16)
 
 - Fix adapter codegen to avoid memory shift overflow, and support SIMD instructions. ([#629](https://github.com/fastly/Viceroy/pull/629))

wasm_abi/adapter/src/macros.rs

@@ -42,7 +42,10 @@ macro_rules! main_ptr {
 #[cfg(feature = "noshift")]
 macro_rules! unsafe_main_ptr {
     ($ptr:expr) => {{
-        $ptr
+        // Always wrap `$ptr` in `unsafe` for consistency with the
+        // `not(feature = "noshift")` version.
+        #[allow(unused_unsafe)]
+        unsafe { $ptr }
     }};
 }
 #[cfg(feature = "noshift")]