add description and rename msrv tests

clippy_lints/src/casts/mod.rs

@@ -448,7 +448,7 @@
     #[clippy::version = "1.65.0"]
     pub PTR_CAST_CONSTNESS,
     pedantic,
-    "TODO"
+    "casting using `as` from and to raw pointers to change constness when specialized methods apply"
 }
 
 declare_clippy_lint! {

clippy_lints/src/casts/ptr_cast_constness.rs

@@ -1,3 +1,4 @@
+use clippy_utils::msrvs::POINTER_CAST_CONSTNESS;
 use clippy_utils::sugg::Sugg;
 use clippy_utils::{diagnostics::span_lint_and_sugg, msrvs::Msrv};
 use if_chain::if_chain;
@@ -5,7 +6,6 @@
 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;
 
@@ -18,7 +18,7 @@ pub(super) fn check(
     msrv: &Msrv,
 ) {
     if_chain! {
-        if msrv.meets(RustcVersion::new(1,65,0));
+        if msrv.meets(POINTER_CAST_CONSTNESS);
         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),

clippy_utils/src/msrvs.rs

@@ -20,7 +20,7 @@ macro_rules! msrv_aliases {
 // names may refer to stabilized feature flags or library items
 msrv_aliases! {
     1,68,0 { PATH_MAIN_SEPARATOR_STR }
-    1,65,0 { LET_ELSE }
+    1,65,0 { LET_ELSE, POINTER_CAST_CONSTNESS }
     1,62,0 { BOOL_THEN_SOME, DEFAULT_ENUM_ATTRIBUTE }
     1,58,0 { FORMAT_ARGS_CAPTURE, PATTERN_TRAIT_CHAR_ARRAY }
     1,55,0 { SEEK_REWIND }

tests/ui/ptr_cast_constness.fixed

@@ -36,7 +36,7 @@ fn main() {
 }
 
 #[clippy::msrv = "1.64"]
-fn _msrv_1_37() {
+fn _msrv_1_64() {
     let ptr: *const u32 = &42_u32;
     let mut_ptr: *mut u32 = &mut 42_u32;
 
@@ -46,7 +46,7 @@ fn _msrv_1_37() {
 }
 
 #[clippy::msrv = "1.65"]
-fn _msrv_1_38() {
+fn _msrv_1_65() {
     let ptr: *const u32 = &42_u32;
     let mut_ptr: *mut u32 = &mut 42_u32;
 

tests/ui/ptr_cast_constness.rs

@@ -36,7 +36,7 @@ fn main() {
 }
 
 #[clippy::msrv = "1.64"]
-fn _msrv_1_37() {
+fn _msrv_1_64() {
     let ptr: *const u32 = &42_u32;
     let mut_ptr: *mut u32 = &mut 42_u32;
 
@@ -46,7 +46,7 @@ fn _msrv_1_37() {
 }
 
 #[clippy::msrv = "1.65"]
-fn _msrv_1_38() {
+fn _msrv_1_65() {
     let ptr: *const u32 = &42_u32;
     let mut_ptr: *mut u32 = &mut 42_u32;