Specify an MSRV of 1.63.0 for assigning_clones

clippy_config/src/msrvs.rs

@@ -23,6 +23,7 @@ macro_rules! msrv_aliases {
     1,70,0 { OPTION_RESULT_IS_VARIANT_AND, BINARY_HEAP_RETAIN }
     1,68,0 { PATH_MAIN_SEPARATOR_STR }
     1,65,0 { LET_ELSE, POINTER_CAST_CONSTNESS }
+    1,63,0 { ASSIGNING_CLONES }
     1,62,0 { BOOL_THEN_SOME, DEFAULT_ENUM_ATTRIBUTE }
     1,59,0 { THREAD_LOCAL_INITIALIZER_CAN_BE_MADE_CONST }
     1,58,0 { FORMAT_ARGS_CAPTURE, PATTERN_TRAIT_CHAR_ARRAY }

clippy_lints/src/assigning_clones.rs

@@ -1,3 +1,4 @@
+use clippy_config::msrvs::{self, Msrv};
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::macros::HirNode;
 use clippy_utils::sugg::Sugg;
@@ -6,7 +7,7 @@
 use rustc_hir::{self as hir, Expr, ExprKind, Node};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty::{self, Instance, Mutability};
-use rustc_session::declare_lint_pass;
+use rustc_session::impl_lint_pass;
 use rustc_span::def_id::DefId;
 use rustc_span::symbol::sym;
 use rustc_span::ExpnKind;
@@ -49,10 +50,26 @@
     perf,
     "assigning the result of cloning may be inefficient"
 }
-declare_lint_pass!(AssigningClones => [ASSIGNING_CLONES]);
+
+pub struct AssigningClones {
+    msrv: Msrv,
+}
+
+impl AssigningClones {
+    #[must_use]
+    pub fn new(msrv: Msrv) -> Self {
+        Self { msrv }
+    }
+}
+
+impl_lint_pass!(AssigningClones => [ASSIGNING_CLONES]);
 
 impl<'tcx> LateLintPass<'tcx> for AssigningClones {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, assign_expr: &'tcx hir::Expr<'_>) {
+        if !self.msrv.meets(msrvs::ASSIGNING_CLONES) {
+            return;
+        }
+
         // Do not fire the lint in macros
         let expn_data = assign_expr.span().ctxt().outer_expn_data();
         match expn_data.kind {
@@ -72,6 +89,8 @@ fn check_expr(&mut self, cx: &LateContext<'tcx>, assign_expr: &'tcx hir::Expr<'_
             suggest(cx, assign_expr, lhs, &call);
         }
     }
+
+    extract_msrv_attr!(LateContext);
 }
 
 // Try to resolve the call to `Clone::clone` or `ToOwned::to_owned`.

clippy_lints/src/lib.rs

@@ -1122,7 +1122,7 @@ pub fn register_lints(store: &mut rustc_lint::LintStore, conf: &'static Conf) {
     store.register_late_pass(move |_| Box::new(incompatible_msrv::IncompatibleMsrv::new(msrv())));
     store.register_late_pass(|_| Box::new(to_string_trait_impl::ToStringTraitImpl));
     store.register_early_pass(|| Box::new(multiple_bound_locations::MultipleBoundLocations));
-    store.register_late_pass(|_| Box::new(assigning_clones::AssigningClones));
+    store.register_late_pass(move |_| Box::new(assigning_clones::AssigningClones::new(msrv())));
     store.register_late_pass(|_| Box::new(zero_repeat_side_effects::ZeroRepeatSideEffects));
     store.register_late_pass(|_| Box::new(manual_unwrap_or_default::ManualUnwrapOrDefault));
     store.register_late_pass(|_| Box::new(integer_division_remainder_used::IntegerDivisionRemainderUsed));