Ignore dead_code warnings in test

    warning: trait `AssertNotSerdeSerialize` is never used
      --> test_suite/tests/test_serde_path.rs:39:7
       |
    39 | trait AssertNotSerdeSerialize {}
       |       ^^^^^^^^^^^^^^^^^^^^^^^
       |
       = note: `#[warn(dead_code)]` on by default

    warning: trait `AssertNotSerdeDeserialize` is never used
      --> test_suite/tests/test_serde_path.rs:43:7
       |
    43 | trait AssertNotSerdeDeserialize<'a> {}
       |       ^^^^^^^^^^^^^^^^^^^^^^^^^

    warning: method `serialize` is never used
      --> test_suite/tests/test_serde_path.rs:31:12
       |
    30 |     pub trait Serialize {
       |               --------- method in this trait
    31 |         fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error>;
       |            ^^^^^^^^^

    warning: associated function `deserialize` is never used
      --> test_suite/tests/test_serde_path.rs:35:12
       |
    34 |     pub trait Deserialize<'a>: Sized {
       |               ----------- associated function in this trait
    35 |         fn deserialize<D: Deserializer<'a>>(deserializer: D) -> Result<Self, D::Error>;
       |            ^^^^^^^^^^^

test_suite/tests/test_serde_path.rs

@@ -27,19 +27,21 @@ mod fake_serde {
     {
     }
 
+    #[allow(dead_code)]
     pub trait Serialize {
         fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error>;
     }
 
+    #[allow(dead_code)]
     pub trait Deserialize<'a>: Sized {
         fn deserialize<D: Deserializer<'a>>(deserializer: D) -> Result<Self, D::Error>;
     }
 }
 
-trait AssertNotSerdeSerialize {}
+pub trait AssertNotSerdeSerialize {}
 
 impl<T: serde::Serialize> AssertNotSerdeSerialize for T {}
 
-trait AssertNotSerdeDeserialize<'a> {}
+pub trait AssertNotSerdeDeserialize<'a> {}
 
 impl<'a, T: serde::Deserialize<'a>> AssertNotSerdeDeserialize<'a> for T {}