Fix build issues with no_std and ptr_metadata

Fix CI script
Fix warnings in on no_std

Signed-off-by: Tin Svagelj <tin.svagelj@live.com>

.github/workflows/rust.yml

@@ -17,7 +17,11 @@ jobs:
       - uses: actions/checkout@v3
       - name: Build default
         run: cargo build --verbose
-      - name: Build
-        run: cargo build --verbose --features ptr_metadata error_in_core
+      - name: Build no_std
+        run: cargo build --verbose --no-default-features --features no_std,error_in_core
+      - name: Build with ptr_metadata
+        run: cargo build --verbose --features ptr_metadata
+      - name: Build restrictive
+        run: cargo build --verbose --no-default-features --features std
       - name: Run tests
-        run: cargo test --verbose --features ptr_metadata error_in_core
+        run: cargo test --verbose --features ptr_metadata

Cargo.toml

@@ -25,7 +25,7 @@ portable-atomic = { version = "1", default-features = false }
 spin = { version = "0.9", optional = true }
 
 [features]
-default = ["no_std", "leak_data"]
+default = ["std", "leak_data"]
 std = ["portable-atomic/std"]
 no_std = ["dep:spin"]
 debug = []

src/lib.rs

@@ -534,7 +534,7 @@ impl<T: ?Sized> SyncContiguousMemoryRef<T> {
     {
         unsafe {
             SyncContiguousMemoryRef {
-                inner: std::mem::transmute(self.inner),
+                inner: core::mem::transmute(self.inner),
                 metadata,
             }
         }
@@ -647,7 +647,7 @@ impl<T: ?Sized> ContiguousMemoryRef<T> {
     {
         unsafe {
             ContiguousMemoryRef {
-                inner: std::mem::transmute(self.inner),
+                inner: core::mem::transmute(self.inner),
                 metadata,
             }
         }

src/types.rs

@@ -66,7 +66,7 @@ impl<T> LockTypesafe<T> for Mutex<T> {
     }
     fn try_lock_named(
         &self,
-        which: MutexKind,
+        _which: MutexKind,
     ) -> Result<MutexGuard<T>, crate::error::LockingError> {
         match self.try_lock() {
             Some(it) => Ok(it),