Add another test case + fmt

compiler/rustc_const_eval/src/transform/check_consts/qualifs.rs

@@ -119,10 +119,8 @@ impl Qualif for NeedsNonConstDrop {
             // without having the lang item present.
             return false;
         };
-        let trait_ref = ty::TraitRef {
+        let trait_ref =
-            def_id: drop_trait,
+            ty::TraitRef { def_id: drop_trait, substs: cx.tcx.mk_substs_trait(ty, &[]) };
-            substs: cx.tcx.mk_substs_trait(ty, &[]),
-        };
         let obligation = Obligation::new(
             ObligationCause::dummy(),
             cx.param_env,

src/test/ui/rfc-2632-const-trait-impl/const-drop-fail.precise.stderr

@@ -1,27 +1,59 @@
+error: `~const` is not allowed here
+  --> $DIR/const-drop-fail.rs:27:35
+   |
+LL | struct ConstDropImplWithBounds<T: ~const A>(PhantomData<T>);
+   |                                   ^^^^^^^^
+   |
+   = note: only allowed on bounds on traits' associated types and functions, const fns, const impls and its associated functions
+
 error[E0277]: the trait bound `NonTrivialDrop: Drop` is not satisfied
-  --> $DIR/const-drop-fail.rs:30:5
+  --> $DIR/const-drop-fail.rs:45:5
    |
 LL |     NonTrivialDrop,
    |     ^^^^^^^^^^^^^^ the trait `Drop` is not implemented for `NonTrivialDrop`
    |
 note: required by a bound in `check`
-  --> $DIR/const-drop-fail.rs:21:19
+  --> $DIR/const-drop-fail.rs:36:19
    |
 LL | const fn check<T: ~const Drop>(_: T) {}
    |                   ^^^^^^^^^^^ required by this bound in `check`
 
 error[E0277]: the trait bound `ConstImplWithDropGlue: Drop` is not satisfied
-  --> $DIR/const-drop-fail.rs:32:5
+  --> $DIR/const-drop-fail.rs:47:5
    |
 LL |     ConstImplWithDropGlue(NonTrivialDrop),
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Drop` is not implemented for `ConstImplWithDropGlue`
    |
 note: required by a bound in `check`
-  --> $DIR/const-drop-fail.rs:21:19
+  --> $DIR/const-drop-fail.rs:36:19
    |
 LL | const fn check<T: ~const Drop>(_: T) {}
    |                   ^^^^^^^^^^^ required by this bound in `check`
 
-error: aborting due to 2 previous errors
+error[E0277]: the trait bound `NonTrivialDrop: A` is not satisfied
+  --> $DIR/const-drop-fail.rs:49:5
+   |
+LL |     ConstDropImplWithBounds::<NonTrivialDrop>(PhantomData),
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `A` is not implemented for `NonTrivialDrop`
+   |
+note: required by `ConstDropImplWithBounds`
+  --> $DIR/const-drop-fail.rs:27:1
+   |
+LL | struct ConstDropImplWithBounds<T: ~const A>(PhantomData<T>);
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error[E0277]: the trait bound `NonTrivialDrop: A` is not satisfied
+  --> $DIR/const-drop-fail.rs:49:5
+   |
+LL |     ConstDropImplWithBounds::<NonTrivialDrop>(PhantomData),
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `A` is not implemented for `NonTrivialDrop`
+   |
+note: required by a bound in `ConstDropImplWithBounds`
+  --> $DIR/const-drop-fail.rs:27:35
+   |
+LL | struct ConstDropImplWithBounds<T: ~const A>(PhantomData<T>);
+   |                                   ^^^^^^^^ required by this bound in `ConstDropImplWithBounds`
+
+error: aborting due to 5 previous errors
 
 For more information about this error, try `rustc --explain E0277`.

src/test/ui/rfc-2632-const-trait-impl/const-drop-fail.rs

@@ -4,6 +4,8 @@
 #![feature(const_fn_trait_bound)]
 #![cfg_attr(precise, feature(const_precise_live_drops))]
 
+use std::marker::PhantomData;
+
 struct NonTrivialDrop;
 
 impl Drop for NonTrivialDrop {
@@ -18,6 +20,19 @@ impl const Drop for ConstImplWithDropGlue {
     fn drop(&mut self) {}
 }
 
+trait A { fn a() { println!("A"); } }
+
+impl A for NonTrivialDrop {}
+
+struct ConstDropImplWithBounds<T: ~const A>(PhantomData<T>);
+//~^ ERROR `~const` is not allowed
+
+impl<T: ~const A> const Drop for ConstDropImplWithBounds<T> {
+    fn drop(&mut self) {
+        T::a();
+    }
+}
+
 const fn check<T: ~const Drop>(_: T) {}
 
 macro_rules! check_all {
@@ -31,6 +46,9 @@ check_all! {
     //~^ ERROR the trait bound
     ConstImplWithDropGlue(NonTrivialDrop),
     //~^ ERROR the trait bound
+    ConstDropImplWithBounds::<NonTrivialDrop>(PhantomData),
+    //~^ ERROR the trait bound
+    //~| ERROR the trait bound
 }
 
 fn main() {}

src/test/ui/rfc-2632-const-trait-impl/const-drop-fail.stock.stderr

@@ -1,27 +1,59 @@
+error: `~const` is not allowed here
+  --> $DIR/const-drop-fail.rs:27:35
+   |
+LL | struct ConstDropImplWithBounds<T: ~const A>(PhantomData<T>);
+   |                                   ^^^^^^^^
+   |
+   = note: only allowed on bounds on traits' associated types and functions, const fns, const impls and its associated functions
+
 error[E0277]: the trait bound `NonTrivialDrop: Drop` is not satisfied
-  --> $DIR/const-drop-fail.rs:30:5
+  --> $DIR/const-drop-fail.rs:45:5
    |
 LL |     NonTrivialDrop,
    |     ^^^^^^^^^^^^^^ the trait `Drop` is not implemented for `NonTrivialDrop`
    |
 note: required by a bound in `check`
-  --> $DIR/const-drop-fail.rs:21:19
+  --> $DIR/const-drop-fail.rs:36:19
    |
 LL | const fn check<T: ~const Drop>(_: T) {}
    |                   ^^^^^^^^^^^ required by this bound in `check`
 
 error[E0277]: the trait bound `ConstImplWithDropGlue: Drop` is not satisfied
-  --> $DIR/const-drop-fail.rs:32:5
+  --> $DIR/const-drop-fail.rs:47:5
    |
 LL |     ConstImplWithDropGlue(NonTrivialDrop),
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Drop` is not implemented for `ConstImplWithDropGlue`
    |
 note: required by a bound in `check`
-  --> $DIR/const-drop-fail.rs:21:19
+  --> $DIR/const-drop-fail.rs:36:19
    |
 LL | const fn check<T: ~const Drop>(_: T) {}
    |                   ^^^^^^^^^^^ required by this bound in `check`
 
-error: aborting due to 2 previous errors
+error[E0277]: the trait bound `NonTrivialDrop: A` is not satisfied
+  --> $DIR/const-drop-fail.rs:49:5
+   |
+LL |     ConstDropImplWithBounds::<NonTrivialDrop>(PhantomData),
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `A` is not implemented for `NonTrivialDrop`
+   |
+note: required by `ConstDropImplWithBounds`
+  --> $DIR/const-drop-fail.rs:27:1
+   |
+LL | struct ConstDropImplWithBounds<T: ~const A>(PhantomData<T>);
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error[E0277]: the trait bound `NonTrivialDrop: A` is not satisfied
+  --> $DIR/const-drop-fail.rs:49:5
+   |
+LL |     ConstDropImplWithBounds::<NonTrivialDrop>(PhantomData),
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `A` is not implemented for `NonTrivialDrop`
+   |
+note: required by a bound in `ConstDropImplWithBounds`
+  --> $DIR/const-drop-fail.rs:27:35
+   |
+LL | struct ConstDropImplWithBounds<T: ~const A>(PhantomData<T>);
+   |                                   ^^^^^^^^ required by this bound in `ConstDropImplWithBounds`
+
+error: aborting due to 5 previous errors
 
 For more information about this error, try `rustc --explain E0277`.