check msrv

clippy_lints/src/casts/mod.rs

@@ -752,7 +752,7 @@ impl<'tcx> LateLintPass<'tcx> for Casts {
                 return;
             }
             cast_slice_from_raw_parts::check(cx, expr, cast_expr, cast_to, &self.msrv);
-            ptr_cast_constness::check(cx, expr, cast_expr, cast_from, cast_to);
+            ptr_cast_constness::check(cx, expr, cast_expr, cast_from, cast_to, &self.msrv);
             as_ptr_cast_mut::check(cx, expr, cast_expr, cast_to);
             fn_to_numeric_cast_any::check(cx, expr, cast_expr, cast_from, cast_to);
             fn_to_numeric_cast::check(cx, expr, cast_expr, cast_from, cast_to);

clippy_lints/src/casts/ptr_cast_constness.rs

@@ -1,15 +1,24 @@
-use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::sugg::Sugg;
+use clippy_utils::{diagnostics::span_lint_and_sugg, msrvs::Msrv};
 use if_chain::if_chain;
 use rustc_errors::Applicability;
 use rustc_hir::{Expr, Mutability};
 use rustc_lint::LateContext;
 use rustc_middle::ty::{self, Ty, TypeAndMut};
+use rustc_semver::RustcVersion;
 
 use super::PTR_CAST_CONSTNESS;
 
-pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, cast_expr: &Expr<'_>, cast_from: Ty<'_>, cast_to: Ty<'_>) {
+pub(super) fn check(
+    cx: &LateContext<'_>,
+    expr: &Expr<'_>,
+    cast_expr: &Expr<'_>,
+    cast_from: Ty<'_>,
+    cast_to: Ty<'_>,
+    msrv: &Msrv,
+) {
     if_chain! {
+        if msrv.meets(RustcVersion::new(1,65,0));
         if let ty::RawPtr(TypeAndMut { mutbl: from_mutbl, .. }) = cast_from.kind();
         if let ty::RawPtr(TypeAndMut { mutbl: to_mutbl, .. }) = cast_to.kind();
         if !matches!((from_mutbl, to_mutbl),

tests/ui/ptr_cast_constness.fixed

@@ -41,8 +41,8 @@ fn _msrv_1_37() {
     let mut_ptr: *mut u32 = &mut 42_u32;
 
     // `pointer::cast_const` and `pointer::cast_mut` were stabilized in 1.65. Do not lint this
-    let _ = ptr.cast_mut();
-    let _ = mut_ptr.cast_const();
+    let _ = ptr as *mut i32;
+    let _ = mut_ptr as *const i32;
 }
 
 #[clippy::msrv = "1.65"]

tests/ui/ptr_cast_constness.stderr

@@ -18,18 +18,6 @@ error: `as` casting between raw pointers while changing its constness
 LL |     let _ = mut_ptr as *const i32;
    |             ^^^^^^^^^^^^^^^^^^^^^ help: try `pointer::cast_const`, a safer alternative: `mut_ptr.cast_const()`
 
-error: `as` casting between raw pointers while changing its constness
-  --> $DIR/ptr_cast_constness.rs:44:13
-   |
-LL |     let _ = ptr as *mut i32;
-   |             ^^^^^^^^^^^^^^^ help: try `pointer::cast_mut`, a safer alternative: `ptr.cast_mut()`
-
-error: `as` casting between raw pointers while changing its constness
-  --> $DIR/ptr_cast_constness.rs:45:13
-   |
-LL |     let _ = mut_ptr as *const i32;
-   |             ^^^^^^^^^^^^^^^^^^^^^ help: try `pointer::cast_const`, a safer alternative: `mut_ptr.cast_const()`
-
 error: `as` casting between raw pointers while changing its constness
   --> $DIR/ptr_cast_constness.rs:53:13
    |
@@ -42,5 +30,5 @@ error: `as` casting between raw pointers while changing its constness
 LL |     let _ = mut_ptr as *const i32;
    |             ^^^^^^^^^^^^^^^^^^^^^ help: try `pointer::cast_const`, a safer alternative: `mut_ptr.cast_const()`
 
-error: aborting due to 7 previous errors
+error: aborting due to 5 previous errors