[ci] Roll nightly toolchain (#1101)

Cargo.toml

@@ -46,7 +46,7 @@ zerocopy-panic-in-const = "1.57.0"
 [package.metadata.ci]
 # The versions of the stable and nightly compiler toolchains to use in CI.
 pinned-stable = "1.77.1"
-pinned-nightly = "nightly-2024-04-05"
+pinned-nightly = "nightly-2024-04-07"
 
 [package.metadata.docs.rs]
 all-features = true

src/lib.rs

@@ -4422,8 +4422,11 @@ macro_rules! transmute {
             // contexts in which `core` was not manually imported. This is not a
             // problem for 2018 edition crates.
             let u = unsafe {
-                // Clippy: It's okay to transmute a type to itself.
-                #[allow(clippy::useless_transmute)]
+                // Clippy:
+                // - It's okay to transmute a type to itself.
+                // - We can't annotate the types; this macro is designed to
+                //   infer the types from the calling context.
+                #[allow(clippy::useless_transmute, clippy::missing_transmute_annotations)]
                 $crate::macro_util::core_reexport::mem::transmute(e)
             };
             $crate::macro_util::must_use(u)

src/macro_util.rs

@@ -309,7 +309,12 @@ macro_rules! assert_align_gt_eq {
             // other words, if `align_of::<T>() >= align_of::<U>()`.
             //
             // SAFETY: This code is never run.
-            max_aligns = unsafe { $crate::macro_util::core_reexport::mem::transmute(align_of) };
+            max_aligns = unsafe {
+                // Clippy: We can't annotate the types; this macro is designed
+                // to infer the types from the calling context.
+                #[allow(clippy::missing_transmute_annotations)]
+                $crate::macro_util::core_reexport::mem::transmute(align_of)
+            };
         } else {
             loop {}
         }
@@ -328,8 +333,11 @@ macro_rules! assert_size_eq {
         if false {
             // SAFETY: This code is never run.
             $u = unsafe {
-                // Clippy: It's okay to transmute a type to itself.
-                #[allow(clippy::useless_transmute)]
+                // Clippy:
+                // - It's okay to transmute a type to itself.
+                // - We can't annotate the types; this macro is designed to
+                //   infer the types from the calling context.
+                #[allow(clippy::useless_transmute, clippy::missing_transmute_annotations)]
                 $crate::macro_util::core_reexport::mem::transmute($t)
             };
         } else {