add the ORDER_DEPENDENT_TRAIT_OBJECTS lint

Author: arielb1

src/librustc/lint/builtin.rs

@@ -208,6 +208,13 @@ declare_lint! {
     "potentially-conflicting impls were erroneously allowed"
 }
 
+declare_lint! {
+    pub ORDER_DEPENDENT_TRAIT_OBJECTS,
+    Deny,
+    // FIXME: ENG
+    "trait-object types are different depending on marker-trait order"
+}
+
 declare_lint! {
     pub BAD_REPR,
     Warn,
@@ -405,6 +412,7 @@ impl LintPass for HardwiredLints {
             PARENTHESIZED_PARAMS_IN_TYPES_AND_MODULES,
             LATE_BOUND_LIFETIME_ARGUMENTS,
             INCOHERENT_FUNDAMENTAL_IMPLS,
+            ORDER_DEPENDENT_TRAIT_OBJECTS,
             DEPRECATED,
             UNUSED_UNSAFE,
             UNUSED_MUT,

src/librustc_lint/lib.rs

@@ -295,6 +295,11 @@ pub fn register_builtins(store: &mut lint::LintStore, sess: Option<&Session>) {
             reference: "issue #46205 <https://github.com/rust-lang/rust/issues/46205>",
             edition: None,
         },
+        FutureIncompatibleInfo {
+            id: LintId::of(ORDER_DEPENDENT_TRAIT_OBJECTS),
+            reference: "issue #33140 <https://github.com/rust-lang/rust/issues/33140>",
+            edition: None,
+        },
         FutureIncompatibleInfo {
             id: LintId::of(TYVAR_BEHIND_RAW_POINTER),
             reference: "issue #46906 <https://github.com/rust-lang/rust/issues/46906>",