3 files changed, 74 insertions, 2 deletions
diff --git a/tests/ui/missing_const_for_fn/cant_be_const.rs b/tests/ui/missing_const_for_fn/cant_be_const.rs
index d026e009684..2750e0cdf3f 100644
--- a/tests/ui/missing_const_for_fn/cant_be_const.rs
+++ b/tests/ui/missing_const_for_fn/cant_be_const.rs
@@ -161,7 +161,23 @@ union U {
     f: u32,
 }
 
-// Do not lint because accessing union fields from const functions is unstable
+// Do not lint because accessing union fields from const functions is unstable in 1.55
+#[clippy::msrv = "1.55"]
 fn h(u: U) -> u32 {
     unsafe { u.f }
 }
+
+mod msrv {
+    struct Foo(*const u8, *mut u8);
+
+    impl Foo {
+        #[clippy::msrv = "1.57"]
+        fn deref_ptr_cannot_be_const(self) -> usize {
+            unsafe { *self.0 as usize }
+        }
+        #[clippy::msrv = "1.58"]
+        fn deref_mut_ptr_cannot_be_const(self) -> usize {
+            unsafe { *self.1 as usize }
+        }
+    }
+}
diff --git a/tests/ui/missing_const_for_fn/could_be_const.rs b/tests/ui/missing_const_for_fn/could_be_const.rs
index 12a8320c8f3..06dbbeb31c0 100644
--- a/tests/ui/missing_const_for_fn/could_be_const.rs
+++ b/tests/ui/missing_const_for_fn/could_be_const.rs
@@ -113,3 +113,31 @@ impl const Drop for D {
 // Lint this, since it can be dropped in const contexts
 // FIXME(effects)
 fn d(this: D) {}
+
+mod msrv {
+    struct Foo(*const u8, &'static u8);
+
+    impl Foo {
+        #[clippy::msrv = "1.58"]
+        fn deref_ptr_can_be_const(self) -> usize {
+            //~^ ERROR: this could be a `const fn`
+            unsafe { *self.0 as usize }
+        }
+
+        fn deref_copied_val(self) -> usize {
+            //~^ ERROR: this could be a `const fn`
+            *self.1 as usize
+        }
+    }
+
+    union Bar {
+        val: u8,
+    }
+
+    #[clippy::msrv = "1.56"]
+    fn union_access_can_be_const() {
+        //~^ ERROR: this could be a `const fn`
+        let bar = Bar { val: 1 };
+        let _ = unsafe { bar.val };
+    }
+}
diff --git a/tests/ui/missing_const_for_fn/could_be_const.stderr b/tests/ui/missing_const_for_fn/could_be_const.stderr
index 082459fd821..b2cade30563 100644
--- a/tests/ui/missing_const_for_fn/could_be_const.stderr
+++ b/tests/ui/missing_const_for_fn/could_be_const.stderr
@@ -102,5 +102,33 @@ LL | |     46
 LL | | }
    | |_^
 
-error: aborting due to 11 previous errors
+error: this could be a `const fn`
+  --> tests/ui/missing_const_for_fn/could_be_const.rs:122:9
+   |
+LL | /         fn deref_ptr_can_be_const(self) -> usize {
+LL | |
+LL | |             unsafe { *self.0 as usize }
+LL | |         }
+   | |_________^
+
+error: this could be a `const fn`
+  --> tests/ui/missing_const_for_fn/could_be_const.rs:127:9
+   |
+LL | /         fn deref_copied_val(self) -> usize {
+LL | |
+LL | |             *self.1 as usize
+LL | |         }
+   | |_________^
+
+error: this could be a `const fn`
+  --> tests/ui/missing_const_for_fn/could_be_const.rs:138:5
+   |
+LL | /     fn union_access_can_be_const() {
+LL | |
+LL | |         let bar = Bar { val: 1 };
+LL | |         let _ = unsafe { bar.val };
+LL | |     }
+   | |_____^
+
+error: aborting due to 14 previous errors