fix: TriviallyDrop::guard should be safe

Signed-off-by: Yaroslav Bolyukin <[email protected]>

Author: CertainLach

gc/src/trace.rs

@@ -20,7 +20,7 @@ pub trait Finalize {
 /// Ensures type has no custom Drop implementation, without implementing it itself
 /// In case of Drop implementation present, obscure compilation error will be raised
 pub unsafe trait TriviallyDrop {
-    unsafe fn guard(self);
+    fn guard(self);
 }
 
 #[cfg(feature = "nightly")]

gc_derive/src/lib.rs

@@ -84,7 +84,7 @@ fn derive_trace(mut s: Structure<'_>) -> proc_macro2::TokenStream {
         let trivially_drop_impl = s.unsafe_bound_impl(
             quote!(::gc::TriviallyDrop),
             quote!(
-                unsafe fn guard(self) {
+                fn guard(self) {
                     match self {
                         #trivially_drop_body
                     }