run cargo dev new_lint

specifically:
cargo dev new_lint --name derive_ord_xor_partial_ord --category correctness --pass late

CHANGELOG.md

@@ -1454,6 +1454,7 @@ Released 2018-09-13
 [`deprecated_semver`]: https://rust-lang.github.io/rust-clippy/master/index.html#deprecated_semver
 [`deref_addrof`]: https://rust-lang.github.io/rust-clippy/master/index.html#deref_addrof
 [`derive_hash_xor_eq`]: https://rust-lang.github.io/rust-clippy/master/index.html#derive_hash_xor_eq
+[`derive_ord_xor_partial_ord`]: https://rust-lang.github.io/rust-clippy/master/index.html#derive_ord_xor_partial_ord
 [`diverging_sub_expression`]: https://rust-lang.github.io/rust-clippy/master/index.html#diverging_sub_expression
 [`doc_markdown`]: https://rust-lang.github.io/rust-clippy/master/index.html#doc_markdown
 [`double_comparisons`]: https://rust-lang.github.io/rust-clippy/master/index.html#double_comparisons

clippy_lints/src/derive_ord_xor_partial_ord.rs

@@ -0,0 +1,28 @@
+use rustc_lint::{LateLintPass, LateContext};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_hir::*;
+
+declare_clippy_lint! {
+    /// **What it does:**
+    ///
+    /// **Why is this bad?**
+    ///
+    /// **Known problems:** None.
+    ///
+    /// **Example:**
+    ///
+    /// ```rust
+    /// // example code where clippy issues a warning
+    /// ```
+    /// Use instead:
+    /// ```rust
+    /// // example code which does not raise clippy warning
+    /// ```
+    pub DERIVE_ORD_XOR_PARTIAL_ORD,
+    correctness,
+    "default lint description"
+}
+
+declare_lint_pass!(DeriveOrdXorPartialOrd => [DERIVE_ORD_XOR_PARTIAL_ORD]);
+
+impl LateLintPass<'_, '_> for DeriveOrdXorPartialOrd {}

clippy_lints/src/lib.rs

@@ -173,6 +173,7 @@ mod dbg_macro;
 mod default_trait_access;
 mod dereference;
 mod derive;
+mod derive_ord_xor_partial_ord;
 mod doc;
 mod double_comparison;
 mod double_parens;
@@ -515,6 +516,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         &derive::DERIVE_HASH_XOR_EQ,
         &derive::EXPL_IMPL_CLONE_ON_COPY,
         &derive::UNSAFE_DERIVE_DESERIALIZE,
+        &derive_ord_xor_partial_ord::DERIVE_ORD_XOR_PARTIAL_ORD,
         &doc::DOC_MARKDOWN,
         &doc::MISSING_ERRORS_DOC,
         &doc::MISSING_SAFETY_DOC,
@@ -1230,6 +1232,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(&copies::IFS_SAME_COND),
         LintId::of(&copies::IF_SAME_THEN_ELSE),
         LintId::of(&derive::DERIVE_HASH_XOR_EQ),
+        LintId::of(&derive_ord_xor_partial_ord::DERIVE_ORD_XOR_PARTIAL_ORD),
         LintId::of(&doc::MISSING_SAFETY_DOC),
         LintId::of(&doc::NEEDLESS_DOCTEST_MAIN),
         LintId::of(&double_comparison::DOUBLE_COMPARISONS),
@@ -1648,6 +1651,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(&copies::IFS_SAME_COND),
         LintId::of(&copies::IF_SAME_THEN_ELSE),
         LintId::of(&derive::DERIVE_HASH_XOR_EQ),
+        LintId::of(&derive_ord_xor_partial_ord::DERIVE_ORD_XOR_PARTIAL_ORD),
         LintId::of(&drop_bounds::DROP_BOUNDS),
         LintId::of(&drop_forget_ref::DROP_COPY),
         LintId::of(&drop_forget_ref::DROP_REF),

src/lintlist/mod.rs

@@ -360,6 +360,13 @@ pub static ref ALL_LINTS: Vec<Lint> = vec![
         deprecation: None,
         module: "derive",
     },
+    Lint {
+        name: "derive_ord_xor_partial_ord",
+        group: "correctness",
+        desc: "default lint description",
+        deprecation: None,
+        module: "derive_ord_xor_partial_ord",
+    },
     Lint {
         name: "diverging_sub_expression",
         group: "complexity",

tests/ui/derive_ord_xor_partial_ord.rs

@@ -0,0 +1,5 @@
+#![warn(clippy::derive_ord_xor_partial_ord)]
+
+fn main() {
+    // test code goes here
+}