diff --git a/tests/ui/traits/auxiliary/force_unstable.rs b/tests/ui/traits/auxiliary/force_unstable.rs
new file mode 100644
index 000000000000..ce71e1241f9c
--- /dev/null
+++ b/tests/ui/traits/auxiliary/force_unstable.rs
@@ -0,0 +1,7 @@
+//@ edition: 2024
+//@ compile-flags: -Zforce-unstable-if-unmarked
+
+// Auxiliary crate that uses `-Zforce-unstable-if-unmarked` to export an
+// "unstable" trait.
+
+pub trait ForeignTrait {}
diff --git a/tests/ui/traits/nightly-only-unstable.force.stderr b/tests/ui/traits/nightly-only-unstable.force.stderr
new file mode 100644
index 000000000000..b24e2867a304
--- /dev/null
+++ b/tests/ui/traits/nightly-only-unstable.force.stderr
@@ -0,0 +1,36 @@
+error[E0277]: the trait bound `(): LocalTrait` is not satisfied
+  --> $DIR/nightly-only-unstable.rs:25:21
+   |
+LL |     use_local_trait(());
+   |     --------------- ^^ the nightly-only, unstable trait `LocalTrait` is not implemented for `()`
+   |     |
+   |     required by a bound introduced by this call
+   |
+help: this trait has no implementations, consider adding one
+  --> $DIR/nightly-only-unstable.rs:14:1
+   |
+LL | trait LocalTrait {}
+   | ^^^^^^^^^^^^^^^^
+note: required by a bound in `use_local_trait`
+  --> $DIR/nightly-only-unstable.rs:16:28
+   |
+LL | fn use_local_trait(_: impl LocalTrait) {}
+   |                            ^^^^^^^^^^ required by this bound in `use_local_trait`
+
+error[E0277]: the trait bound `(): ForeignTrait` is not satisfied
+  --> $DIR/nightly-only-unstable.rs:31:23
+   |
+LL |     use_foreign_trait(());
+   |     ----------------- ^^ the nightly-only, unstable trait `ForeignTrait` is not implemented for `()`
+   |     |
+   |     required by a bound introduced by this call
+   |
+note: required by a bound in `use_foreign_trait`
+  --> $DIR/nightly-only-unstable.rs:20:30
+   |
+LL | fn use_foreign_trait(_: impl force_unstable::ForeignTrait) {}
+   |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `use_foreign_trait`
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/traits/nightly-only-unstable.normal.stderr b/tests/ui/traits/nightly-only-unstable.normal.stderr
new file mode 100644
index 000000000000..51b896cfefdf
--- /dev/null
+++ b/tests/ui/traits/nightly-only-unstable.normal.stderr
@@ -0,0 +1,36 @@
+error[E0277]: the trait bound `(): LocalTrait` is not satisfied
+  --> $DIR/nightly-only-unstable.rs:25:21
+   |
+LL |     use_local_trait(());
+   |     --------------- ^^ the trait `LocalTrait` is not implemented for `()`
+   |     |
+   |     required by a bound introduced by this call
+   |
+help: this trait has no implementations, consider adding one
+  --> $DIR/nightly-only-unstable.rs:14:1
+   |
+LL | trait LocalTrait {}
+   | ^^^^^^^^^^^^^^^^
+note: required by a bound in `use_local_trait`
+  --> $DIR/nightly-only-unstable.rs:16:28
+   |
+LL | fn use_local_trait(_: impl LocalTrait) {}
+   |                            ^^^^^^^^^^ required by this bound in `use_local_trait`
+
+error[E0277]: the trait bound `(): ForeignTrait` is not satisfied
+  --> $DIR/nightly-only-unstable.rs:31:23
+   |
+LL |     use_foreign_trait(());
+   |     ----------------- ^^ the nightly-only, unstable trait `ForeignTrait` is not implemented for `()`
+   |     |
+   |     required by a bound introduced by this call
+   |
+note: required by a bound in `use_foreign_trait`
+  --> $DIR/nightly-only-unstable.rs:20:30
+   |
+LL | fn use_foreign_trait(_: impl force_unstable::ForeignTrait) {}
+   |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `use_foreign_trait`
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/traits/nightly-only-unstable.rs b/tests/ui/traits/nightly-only-unstable.rs
new file mode 100644
index 000000000000..c3fa5df944b6
--- /dev/null
+++ b/tests/ui/traits/nightly-only-unstable.rs
@@ -0,0 +1,36 @@
+//@ revisions: normal force
+//@ edition: 2024
+//@ aux-crate: force_unstable=force_unstable.rs
+//@[force] compile-flags: -Zforce-unstable-if-unmarked
+
+#![feature(rustc_private)]
+
+// Regression test for <https://github.com/rust-lang/rust/issues/152692>.
+//
+// When building a crate with `-Zforce-unstable-if-unmarked` (e.g. the compiler or stdlib),
+// it's unhelpful to mention that a not-implemented trait is unstable, because that will
+// be true of every local and foreign trait that isn't explicitly marked stable.
+
+trait LocalTrait {}
+
+fn use_local_trait(_: impl LocalTrait) {}
+//~^ NOTE required by a bound in `use_local_trait`
+//~| NOTE required by this bound in `use_local_trait`
+
+fn use_foreign_trait(_: impl force_unstable::ForeignTrait) {}
+//~^ NOTE required by a bound in `use_foreign_trait`
+//~| NOTE required by this bound in `use_foreign_trait`
+
+fn main() {
+    use_local_trait(());
+    //~^ ERROR the trait bound `(): LocalTrait` is not satisfied
+    //[normal]~| NOTE the trait `LocalTrait` is not implemented for `()`
+    //[force]~| NOTE the nightly-only, unstable trait `LocalTrait` is not implemented for `()`
+    //~| NOTE required by a bound introduced by this call
+
+    use_foreign_trait(());
+    //~^ ERROR the trait bound `(): ForeignTrait` is not satisfied
+    //[normal]~| NOTE the nightly-only, unstable trait `ForeignTrait` is not implemented for `()`
+    //[force]~| NOTE the nightly-only, unstable trait `ForeignTrait` is not implemented for `()`
+    //~| NOTE required by a bound introduced by this call
+}