Ignore unnested_or_patterns suggesting unstable code

Clippy bug: https://github.com/rust-lang/rust-clippy/issues/5704

serde/src/lib.rs

@@ -95,6 +95,8 @@
 #![cfg_attr(
     feature = "cargo-clippy",
     allow(
+        // clippy bug: https://github.com/rust-lang/rust-clippy/issues/5704
+        unnested_or_patterns,
         // not available in our oldest supported compiler
         checked_conversions,
         empty_enum,

serde_derive/src/lib.rs

@@ -24,7 +24,9 @@
     clippy::too_many_arguments,
     clippy::trivially_copy_pass_by_ref,
     clippy::used_underscore_binding,
-    clippy::wildcard_in_or_patterns
+    clippy::wildcard_in_or_patterns,
+    // clippy bug: https://github.com/rust-lang/rust-clippy/issues/5704
+    clippy::unnested_or_patterns,
 )]
 // Ignored clippy_pedantic lints
 #![allow(

serde_derive_internals/lib.rs

@@ -7,7 +7,9 @@
         cognitive_complexity,
         redundant_field_names,
         trivially_copy_pass_by_ref,
-        wildcard_in_or_patterns
+        wildcard_in_or_patterns,
+        // clippy bug: https://github.com/rust-lang/rust-clippy/issues/5704
+        unnested_or_patterns,
     )
 )]