diff --git a/glib/tests/subclass_compiletest/02-no-auto-send-sync.stderr b/glib/tests/subclass_compiletest/02-no-auto-send-sync.stderr
index 7944f2d31375..e6a61a6eec32 100644
--- a/glib/tests/subclass_compiletest/02-no-auto-send-sync.stderr
+++ b/glib/tests/subclass_compiletest/02-no-auto-send-sync.stderr
@@ -6,7 +6,7 @@ error[E0277]: `RefCell<std::string::String>` cannot be shared between threads sa
    |     |
    |     required by a bound introduced by this call
    |
-   = help: within `imp::TestObject`, the trait `Sync` is not implemented for `RefCell<std::string::String>`, which is required by `TestObject: Send`
+   = help: within `imp::TestObject`, the trait `Sync` is not implemented for `RefCell<std::string::String>`
    = note: if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock` instead
 note: required because it appears within the type `imp::TestObject`
   --> tests/subclass_compiletest/02-no-auto-send-sync.rs:6:16
diff --git a/glib/tests/subclass_compiletest/03-object-no-auto-send-sync.stderr b/glib/tests/subclass_compiletest/03-object-no-auto-send-sync.stderr
index d7605241531f..4fc7bdc3967f 100644
--- a/glib/tests/subclass_compiletest/03-object-no-auto-send-sync.stderr
+++ b/glib/tests/subclass_compiletest/03-object-no-auto-send-sync.stderr
@@ -6,7 +6,7 @@ error[E0277]: `*mut c_void` cannot be sent between threads safely
   |     |
   |     required by a bound introduced by this call
   |
-  = help: the trait `Send` is not implemented for `*mut c_void`, which is required by `Object: Send`
+  = help: the trait `Send` is not implemented for `*mut c_void`
   = note: required for `TypedObjectRef<*mut c_void, ()>` to implement `Send`
 note: required because it appears within the type `Object`
  --> src/object.rs
@@ -27,7 +27,7 @@ error[E0277]: `*mut c_void` cannot be shared between threads safely
   |     |
   |     required by a bound introduced by this call
   |
-  = help: the trait `Sync` is not implemented for `*mut c_void`, which is required by `Object: Send`
+  = help: the trait `Sync` is not implemented for `*mut c_void`
   = note: required for `TypedObjectRef<*mut c_void, ()>` to implement `Send`
 note: required because it appears within the type `Object`
  --> src/object.rs
diff --git a/glib/tests/subclass_compiletest/05-no-auto-send-sync-with-non-send-sync-parent.stderr b/glib/tests/subclass_compiletest/05-no-auto-send-sync-with-non-send-sync-parent.stderr
index 25d8f3d9a3b8..c6939eaa9552 100644
--- a/glib/tests/subclass_compiletest/05-no-auto-send-sync-with-non-send-sync-parent.stderr
+++ b/glib/tests/subclass_compiletest/05-no-auto-send-sync-with-non-send-sync-parent.stderr
@@ -6,7 +6,7 @@ error[E0277]: `RefCell<std::string::String>` cannot be shared between threads sa
    |     |
    |     required by a bound introduced by this call
    |
-   = help: within `imp_parent::TestParent`, the trait `Sync` is not implemented for `RefCell<std::string::String>`, which is required by `TestObject: Send`
+   = help: within `imp_parent::TestParent`, the trait `Sync` is not implemented for `RefCell<std::string::String>`
    = note: if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock` instead
 note: required because it appears within the type `imp_parent::TestParent`
   --> tests/subclass_compiletest/05-no-auto-send-sync-with-non-send-sync-parent.rs:6:16
diff --git a/glib/tests/subclass_compiletest/06-no-auto-send-sync-with-non-send-sync-ffi-parent.stderr b/glib/tests/subclass_compiletest/06-no-auto-send-sync-with-non-send-sync-ffi-parent.stderr
index 78e094d48c35..0bb1b5bb969a 100644
--- a/glib/tests/subclass_compiletest/06-no-auto-send-sync-with-non-send-sync-ffi-parent.stderr
+++ b/glib/tests/subclass_compiletest/06-no-auto-send-sync-with-non-send-sync-ffi-parent.stderr
@@ -6,7 +6,7 @@ error[E0277]: `*mut c_void` cannot be sent between threads safely
    |     |
    |     required by a bound introduced by this call
    |
-   = help: the trait `Send` is not implemented for `*mut c_void`, which is required by `TestObject: Send`
+   = help: the trait `Send` is not implemented for `*mut c_void`
    = note: required for `TypedObjectRef<*mut c_void, ()>` to implement `Send`
 note: required because it appears within the type `InitiallyUnowned`
   --> tests/subclass_compiletest/06-no-auto-send-sync-with-non-send-sync-ffi-parent.rs:3:16
@@ -33,7 +33,7 @@ error[E0277]: `*mut c_void` cannot be shared between threads safely
    |     |
    |     required by a bound introduced by this call
    |
-   = help: the trait `Sync` is not implemented for `*mut c_void`, which is required by `TestObject: Send`
+   = help: the trait `Sync` is not implemented for `*mut c_void`
    = note: required for `TypedObjectRef<*mut c_void, ()>` to implement `Send`
 note: required because it appears within the type `InitiallyUnowned`
   --> tests/subclass_compiletest/06-no-auto-send-sync-with-non-send-sync-ffi-parent.rs:3:16