Removed DUPLICATE_ASSOCIATED_TYPE_BINDINGS lint.

This has been replaced by the hard error E0719.

src/librustc/lint/builtin.rs

@@ -300,12 +300,6 @@ declare_lint! {
     "detects labels that are never used"
 }
 
-declare_lint! {
-    pub DUPLICATE_ASSOCIATED_TYPE_BINDINGS,
-    Warn,
-    "warns about duplicate associated type bindings in generics"
-}
-
 declare_lint! {
     pub DUPLICATE_MACRO_EXPORTS,
     Deny,
@@ -418,7 +412,6 @@ impl LintPass for HardwiredLints {
             ABSOLUTE_PATHS_NOT_STARTING_WITH_CRATE,
             UNSTABLE_NAME_COLLISIONS,
             IRREFUTABLE_LET_PATTERNS,
-            DUPLICATE_ASSOCIATED_TYPE_BINDINGS,
             DUPLICATE_MACRO_EXPORTS,
             INTRA_DOC_LINK_RESOLUTION_FAILURE,
             MISSING_DOC_CODE_EXAMPLES,

src/librustc_lint/lib.rs

@@ -317,11 +317,6 @@ pub fn register_builtins(store: &mut lint::LintStore, sess: Option<&Session>) {
             reference: "issue #51443 <https://github.com/rust-lang/rust/issues/51443>",
             edition: None,
         },
-        FutureIncompatibleInfo {
-            id: LintId::of(DUPLICATE_ASSOCIATED_TYPE_BINDINGS),
-            reference: "issue #50589 <https://github.com/rust-lang/rust/issues/50589>",
-            edition: None,
-        },
         FutureIncompatibleInfo {
             id: LintId::of(PROC_MACRO_DERIVE_RESOLUTION_FALLBACK),
             reference: "issue #50504 <https://github.com/rust-lang/rust/issues/50504>",