Fix rustdoc ICE

Author: juntyr

src/safety/register_fit.rs

@@ -11,15 +11,22 @@ mod private {
     #[derive(PartialEq, Eq, core::marker::ConstParamTy)]
     pub enum TypeSize {
         TypeFitsInto64Bits,
+        // FIXME: ConstParamTy variant with str ICEs in rustdoc
+        #[cfg(not(doc))]
         TypeExeceeds64Bits(&'static str),
+        #[cfg(doc)]
+        TypeExeceeds64Bits,
     }
 
     impl TypeSize {
         pub const fn check<T>() -> Self {
             if core::mem::size_of::<T>() <= core::mem::size_of::<u64>() {
                 Self::TypeFitsInto64Bits
             } else {
-                Self::TypeExeceeds64Bits(core::any::type_name::<T>())
+                #[cfg(not(doc))]
+                { Self::TypeExeceeds64Bits(core::any::type_name::<T>()) }
+                #[cfg(doc)]
+                { Self::TypeExeceeds64Bits }
             }
         }
     }