Fix type inference failures in PartialOrd/Ord impls

Author: sfackler

src/trait_handlers/ord/ord_enum.rs

@@ -210,7 +210,7 @@ impl TraitHandler for OrdEnumHandler {
         } else {
             let discriminant_cmp = quote! {
                 unsafe {
-                    ::core::cmp::Ord::cmp(&*<*const _>::from(self).cast::<#discriminant_type>(), &*<*const _>::from(other).cast::<#discriminant_type>())
+                    ::core::cmp::Ord::cmp(&*<*const Self>::from(self).cast::<#discriminant_type>(), &*<*const Self>::from(other).cast::<#discriminant_type>())
                 }
             };
 

src/trait_handlers/partial_ord/partial_ord_enum.rs

@@ -215,7 +215,7 @@ impl TraitHandler for PartialOrdEnumHandler {
         } else {
             let discriminant_cmp = quote! {
                 unsafe {
-                    ::core::cmp::Ord::cmp(&*<*const _>::from(self).cast::<#discriminant_type>(), &*<*const _>::from(other).cast::<#discriminant_type>())
+                    ::core::cmp::Ord::cmp(&*<*const Self>::from(self).cast::<#discriminant_type>(), &*<*const Self>::from(other).cast::<#discriminant_type>())
                 }
             };