Fix errir when lender is not used

Author: jhg

src/error.rs

@@ -30,6 +30,7 @@ impl core::fmt::Display for PointerError {
     fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
         match self {
             Self::Null => write!(f, "dereference a null pointer will produce a crash"),
+            #[cfg(all(feature = "std", feature = "lender"))]
             Self::Invalid => write!(f, "dereference a unknown pointer could produce a crash"),
             #[cfg(all(feature = "std", feature = "lender"))]
             Self::InvalidType => write!(

src/lib.rs

@@ -63,6 +63,7 @@ pub fn raw<T: 'static>(data: T) -> Result<*mut T, PointerError> {
 #[allow(clippy::not_unsafe_ptr_arg_deref)]
 pub unsafe fn own_back<T: 'static>(pointer: *mut T) -> Result<T, PointerError> {
     validation::not_null_pointer(pointer)?;
+    #[cfg(all(feature = "std", feature = "lender"))]
     validation::lent_pointer(pointer)?;
     let boxed = { Box::from_raw(pointer) };
 

src/validation.rs

@@ -13,10 +13,8 @@ pub fn not_null_pointer<T>(pointer: *const T) -> Result<(), PointerError> {
 }
 
 #[inline]
+#[cfg(all(feature = "std", feature = "lender"))]
 pub fn lent_pointer<T: 'static>(pointer: *const T) -> Result<(), PointerError> {
-    #[cfg(not(all(feature = "std", feature = "lender")))]
-    return Ok(());
-    #[cfg(all(feature = "std", feature = "lender"))]
     match lender::lent_type_of(pointer) {
         Some(type_id) if type_id != std::any::TypeId::of::<T>() => {
             log::error!(