Avoid silencing relevant follow-up errors

2 files changed, 13 insertions, 2 deletions

diff --git a/tests/ui/stability-attribute/generics-default-stability-where.rs b/tests/ui/stability-attribute/generics-default-stability-where.rs
index 4afbca26264..142de12e152 100644
--- a/tests/ui/stability-attribute/generics-default-stability-where.rs
+++ b/tests/ui/stability-attribute/generics-default-stability-where.rs
@@ -5,6 +5,7 @@ extern crate unstable_generic_param;
 use unstable_generic_param::*;
 
 impl<T> Trait3<usize> for T where T: Trait2<usize> { //~ ERROR use of unstable library feature 'unstable_default'
+//~^ ERROR `T` must be used as the type parameter for some local type
     fn foo() -> usize { T::foo() }
 }
 
diff --git a/tests/ui/stability-attribute/generics-default-stability-where.stderr b/tests/ui/stability-attribute/generics-default-stability-where.stderr
index ce34f96771c..16b560e8a4b 100644
--- a/tests/ui/stability-attribute/generics-default-stability-where.stderr
+++ b/tests/ui/stability-attribute/generics-default-stability-where.stderr
@@ -6,6 +6,16 @@ LL | impl<T> Trait3<usize> for T where T: Trait2<usize> {
    |
    = help: add `#![feature(unstable_default)]` to the crate attributes to enable
 
-error: aborting due to 1 previous error
+error[E0210]: type parameter `T` must be used as the type parameter for some local type (e.g., `MyStruct<T>`)
+  --> $DIR/generics-default-stability-where.rs:7:6
+   |
+LL | impl<T> Trait3<usize> for T where T: Trait2<usize> {
+   |      ^ type parameter `T` must be used as the type parameter for some local type
+   |
+   = note: implementing a foreign trait is only possible if at least one of the types for which it is implemented is local
+   = note: only traits defined in the current crate can be implemented for a type parameter
+
+error: aborting due to 2 previous errors
 
-For more information about this error, try `rustc --explain E0658`.
+Some errors have detailed explanations: E0210, E0658.
+For more information about an error, try `rustc --explain E0210`.