Support &mut [u8]
diff --git a/syntax/parse.rs b/syntax/parse.rs
index 38b3dcc..c6d6480 100644
--- a/syntax/parse.rs
+++ b/syntax/parse.rs
@@ -658,7 +658,7 @@
             }
         }
         Type::Slice(slice) => match &slice.inner {
-            Type::Ident(ident) if ident.rust == U8 && ty.mutability.is_none() => Type::SliceRefU8,
+            Type::Ident(ident) if ident.rust == U8 => Type::SliceRefU8,
             _ => Type::Ref,
         },
         _ => Type::Ref,