Add Tests

Author: veera-sivarajan

tests/ui/consts/const-eval/ptr-to-int-transmute-in-consts-issue-87525.rs

@@ -0,0 +1,70 @@
+const fn foo(ptr: *const u8) -> usize {
+    unsafe {
+        std::mem::transmute(ptr)
+        //~^ ERROR pointers cannot be transmuted to integers
+    }
+}
+
+trait Human {
+    const ID: u64 = {
+        let value = 10;
+        let ptr: *const i32 = &value;
+        unsafe {
+            std::mem::transmute(ptr)
+            //~^ ERROR pointers cannot be transmuted to integers
+        }
+    };
+
+    fn id_plus_one() -> u64 {
+        Self::ID + 1
+    }
+}
+
+struct Type<T>(T);
+
+impl<T> Type<T> {
+    const ID: u64 = {
+        let value = 10;
+        let ptr: *const i32 = &value;
+        unsafe {
+            std::mem::transmute(ptr)
+            //~^ ERROR pointers cannot be transmuted to integers
+        }
+    };
+
+    fn id_plus_one() -> u64 {
+        Self::ID + 1
+    }
+}
+
+fn control(ptr: *const u8) -> usize {
+    unsafe {
+        std::mem::transmute(ptr)
+    }
+}
+
+struct ControlStruct;
+
+impl ControlStruct {
+    fn new() -> usize {
+        let value = 10;
+        let ptr: *const i32 = &value;
+        unsafe {
+            std::mem::transmute(ptr)
+        }
+    }
+}
+
+
+const fn zoom(ptr: *const u8) -> usize {
+    unsafe {
+        std::mem::transmute(ptr)
+        //~^ ERROR pointers cannot be transmuted to integers
+    }
+}
+        
+fn main() {
+    const a: u8 = 10;
+    const value: usize = zoom(&a);
+    //~^ ERROR evaluation of constant value failed
+}

tests/ui/consts/const-eval/ptr-to-int-transmute-in-consts-issue-87525.stderr

@@ -0,0 +1,12 @@
+error[E0080]: evaluation of constant value failed
+  --> $DIR/ptr-to-int-transmute-in-consts-issue-87525.rs:68:26
+   |
+LL |     const value: usize = zoom(&a);
+   |                          ^^^^^^^^ unable to turn pointer into integer
+   |
+   = help: this code performed an operation that depends on the underlying bytes representing a pointer
+   = help: the absolute address of a pointer is not known at compile-time, so such operations are not supported
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0080`.