diff --git a/tests/ui/rfcs/rfc-2632-const-trait-impl/tilde-const-and-const-params.rs b/tests/ui/rfcs/rfc-2632-const-trait-impl/tilde-const-and-const-params.rs
index 89d74cecfdb7..4b720b534a49 100644
--- a/tests/ui/rfcs/rfc-2632-const-trait-impl/tilde-const-and-const-params.rs
+++ b/tests/ui/rfcs/rfc-2632-const-trait-impl/tilde-const-and-const-params.rs
@@ -7,7 +7,8 @@ struct Foo<const N: usize>;
 
 impl<const N: usize> Foo<N> {
     fn add<A: ~const Add42>(self) -> Foo<{ A::add(N) }> {
-        //~^ ERROR mismatched types
+        //~^ ERROR `~const` is not allowed here
+        //~| ERROR mismatched types
         Foo
     }
 }
@@ -30,7 +31,7 @@ fn bar<A: ~const Add42, const N: usize>(_: Foo<N>) -> Foo<{ A::add(N) }> {
 }
 
 fn main() {
-   let foo = Foo::<0>;
-   let foo = bar::<(), _>(foo);
-   let _foo = bar::<(), _>(foo);
+    let foo = Foo::<0>;
+    let foo = bar::<(), _>(foo);
+    let _foo = bar::<(), _>(foo);
 }
diff --git a/tests/ui/rfcs/rfc-2632-const-trait-impl/tilde-const-and-const-params.stderr b/tests/ui/rfcs/rfc-2632-const-trait-impl/tilde-const-and-const-params.stderr
index ec5d21d33c6e..be7a83dc1841 100644
--- a/tests/ui/rfcs/rfc-2632-const-trait-impl/tilde-const-and-const-params.stderr
+++ b/tests/ui/rfcs/rfc-2632-const-trait-impl/tilde-const-and-const-params.stderr
@@ -1,17 +1,29 @@
 error: `~const` is not allowed here
-  --> $DIR/tilde-const-and-const-params.rs:26:11
+  --> $DIR/tilde-const-and-const-params.rs:9:15
+   |
+LL |     fn add<A: ~const Add42>(self) -> Foo<{ A::add(N) }> {
+   |               ^^^^^^^^^^^^
+   |
+note: this function is not `const`, so it cannot have `~const` trait bounds
+  --> $DIR/tilde-const-and-const-params.rs:9:8
+   |
+LL |     fn add<A: ~const Add42>(self) -> Foo<{ A::add(N) }> {
+   |        ^^^
+
+error: `~const` is not allowed here
+  --> $DIR/tilde-const-and-const-params.rs:27:11
    |
 LL | fn bar<A: ~const Add42, const N: usize>(_: Foo<N>) -> Foo<{ A::add(N) }> {
    |           ^^^^^^^^^^^^
    |
 note: this function is not `const`, so it cannot have `~const` trait bounds
-  --> $DIR/tilde-const-and-const-params.rs:26:4
+  --> $DIR/tilde-const-and-const-params.rs:27:4
    |
 LL | fn bar<A: ~const Add42, const N: usize>(_: Foo<N>) -> Foo<{ A::add(N) }> {
    |    ^^^
 
 error[E0308]: mismatched types
-  --> $DIR/tilde-const-and-const-params.rs:26:61
+  --> $DIR/tilde-const-and-const-params.rs:27:61
    |
 LL | fn bar<A: ~const Add42, const N: usize>(_: Foo<N>) -> Foo<{ A::add(N) }> {
    |                                                             ^^^^^^^^^ expected `false`, found `true`
@@ -28,6 +40,6 @@ LL |     fn add<A: ~const Add42>(self) -> Foo<{ A::add(N) }> {
    = note: expected constant `false`
               found constant `true`
 
-error: aborting due to 3 previous errors
+error: aborting due to 4 previous errors
 
 For more information about this error, try `rustc --explain E0308`.
diff --git a/tests/ui/rfcs/rfc-2632-const-trait-impl/trait-where-clause.rs b/tests/ui/rfcs/rfc-2632-const-trait-impl/trait-where-clause.rs
index 85ca5fc90487..d9d46d260fb0 100644
--- a/tests/ui/rfcs/rfc-2632-const-trait-impl/trait-where-clause.rs
+++ b/tests/ui/rfcs/rfc-2632-const-trait-impl/trait-where-clause.rs
@@ -5,8 +5,12 @@ trait Bar {}
 
 trait Foo {
     fn a();
-    fn b() where Self: ~const Bar;
+    fn b()
+    where
+        Self: ~const Bar;
+    //~^ ERROR `~const` is not allowed here
     fn c<T: ~const Bar>();
+    //~^ ERROR `~const` is not allowed here
 }
 
 fn test1<T: Foo>() {
diff --git a/tests/ui/rfcs/rfc-2632-const-trait-impl/trait-where-clause.stderr b/tests/ui/rfcs/rfc-2632-const-trait-impl/trait-where-clause.stderr
index 255878e17752..fa6c46ceaa5a 100644
--- a/tests/ui/rfcs/rfc-2632-const-trait-impl/trait-where-clause.stderr
+++ b/tests/ui/rfcs/rfc-2632-const-trait-impl/trait-where-clause.stderr
@@ -1,27 +1,54 @@
+error: `~const` is not allowed here
+  --> $DIR/trait-where-clause.rs:10:15
+   |
+LL |         Self: ~const Bar;
+   |               ^^^^^^^^^^
+   |
+note: this function is not `const`, so it cannot have `~const` trait bounds
+  --> $DIR/trait-where-clause.rs:8:8
+   |
+LL |     fn b()
+   |        ^
+
+error: `~const` is not allowed here
+  --> $DIR/trait-where-clause.rs:12:13
+   |
+LL |     fn c<T: ~const Bar>();
+   |             ^^^^^^^^^^
+   |
+note: this function is not `const`, so it cannot have `~const` trait bounds
+  --> $DIR/trait-where-clause.rs:12:8
+   |
+LL |     fn c<T: ~const Bar>();
+   |        ^
+
 error[E0277]: the trait bound `T: Bar` is not satisfied
-  --> $DIR/trait-where-clause.rs:14:5
+  --> $DIR/trait-where-clause.rs:18:5
    |
 LL |     T::b();
    |     ^ the trait `Bar` is not implemented for `T`
    |
 note: required by a bound in `Foo::b`
-  --> $DIR/trait-where-clause.rs:8:24
+  --> $DIR/trait-where-clause.rs:10:15
    |
-LL |     fn b() where Self: ~const Bar;
-   |                        ^^^^^^^^^^ required by this bound in `Foo::b`
+LL |     fn b()
+   |        - required by a bound in this associated function
+LL |     where
+LL |         Self: ~const Bar;
+   |               ^^^^^^^^^^ required by this bound in `Foo::b`
 help: consider further restricting this bound
    |
 LL | fn test1<T: Foo + Bar>() {
    |                 +++++
 
 error[E0277]: the trait bound `T: Bar` is not satisfied
-  --> $DIR/trait-where-clause.rs:16:12
+  --> $DIR/trait-where-clause.rs:20:12
    |
 LL |     T::c::<T>();
    |            ^ the trait `Bar` is not implemented for `T`
    |
 note: required by a bound in `Foo::c`
-  --> $DIR/trait-where-clause.rs:9:13
+  --> $DIR/trait-where-clause.rs:12:13
    |
 LL |     fn c<T: ~const Bar>();
    |             ^^^^^^^^^^ required by this bound in `Foo::c`
@@ -30,6 +57,6 @@ help: consider further restricting this bound
 LL | fn test1<T: Foo + Bar>() {
    |                 +++++
 
-error: aborting due to 2 previous errors
+error: aborting due to 4 previous errors
 
 For more information about this error, try `rustc --explain E0277`.