Add test

Author: oli-obk

tests/ui/traits/const-traits/drop-manually-drop-no-drop-impl.rs

@@ -0,0 +1,17 @@
+//@[new] compile-flags: -Znext-solver
+//@ revisions: old new
+//@ check-pass
+
+use std::mem::ManuallyDrop;
+
+struct Moose;
+
+impl Drop for Moose {
+    fn drop(&mut self) {}
+}
+
+struct ConstDropper<T>(ManuallyDrop<T>);
+
+const fn foo(_var: ConstDropper<Moose>) {}
+
+fn main() {}

tests/ui/traits/const-traits/drop-manually-drop.new.stderr

@@ -0,0 +1,11 @@
+error[E0493]: destructor of `ConstDropper<Moose>` cannot be evaluated at compile-time
+  --> $DIR/drop-manually-drop.rs:21:14
+   |
+LL | const fn foo(_var: ConstDropper<Moose>) {}
+   |              ^^^^                        - value is dropped here
+   |              |
+   |              the destructor for this type cannot be evaluated in constant functions
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0493`.

tests/ui/traits/const-traits/drop-manually-drop.old.stderr

@@ -0,0 +1,11 @@
+error[E0493]: destructor of `ConstDropper<Moose>` cannot be evaluated at compile-time
+  --> $DIR/drop-manually-drop.rs:21:14
+   |
+LL | const fn foo(_var: ConstDropper<Moose>) {}
+   |              ^^^^                        - value is dropped here
+   |              |
+   |              the destructor for this type cannot be evaluated in constant functions
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0493`.

tests/ui/traits/const-traits/drop-manually-drop.rs

@@ -0,0 +1,24 @@
+//@[new] compile-flags: -Znext-solver
+//@ revisions: old new
+
+#![feature(const_destruct)]
+#![feature(const_trait_impl)]
+
+use std::mem::ManuallyDrop;
+
+struct Moose;
+
+impl Drop for Moose {
+    fn drop(&mut self) {}
+}
+
+struct ConstDropper<T>(ManuallyDrop<T>);
+
+impl<T> const Drop for ConstDropper<T> {
+    fn drop(&mut self) {}
+}
+
+const fn foo(_var: ConstDropper<Moose>) {}
+//~^ ERROR destructor of `ConstDropper<Moose>` cannot be evaluated at compile-time
+
+fn main() {}