feat(repeated_is_diagnostic_item): new internal lint

Author: ada4a

clippy_lints_internal/src/internal_paths.rs

@@ -17,6 +17,7 @@ pub static TY_CTXT: PathLookup = type_path!(rustc_middle::ty::TyCtxt);
 
 // Paths in clippy itself
 pub static CLIPPY_SYM_MODULE: PathLookup = type_path!(clippy_utils::sym);
+pub static MAYBE_DEF: PathLookup = type_path!(clippy_utils::res::MaybeDef);
 pub static MSRV_STACK: PathLookup = type_path!(clippy_utils::msrvs::MsrvStack);
 pub static PATH_LOOKUP_NEW: PathLookup = value_path!(clippy_utils::paths::PathLookup::new);
 pub static SPAN_LINT_AND_THEN: PathLookup = value_path!(clippy_utils::diagnostics::span_lint_and_then);

clippy_lints_internal/src/lib.rs

@@ -38,6 +38,7 @@ mod lint_without_lint_pass;
 mod msrv_attr_impl;
 mod outer_expn_data_pass;
 mod produce_ice;
+mod repeated_is_diagnostic_item;
 mod symbols;
 mod unnecessary_def_path;
 mod unsorted_clippy_utils_paths;
@@ -77,4 +78,5 @@ pub fn register_lints(store: &mut LintStore) {
     store.register_late_pass(|_| Box::new(msrv_attr_impl::MsrvAttrImpl));
     store.register_late_pass(|_| Box::new(almost_standard_lint_formulation::AlmostStandardFormulation::new()));
     store.register_late_pass(|_| Box::new(unusual_names::UnusualNames));
+    store.register_late_pass(|_| Box::new(repeated_is_diagnostic_item::RepeatedIsDiagnosticItem));
 }