1 files changed, 26 insertions, 0 deletions
diff --git a/src/test/ui/generic-associated-types/gat-in-trait-path-undeclared-lifetime.stderr b/src/test/ui/generic-associated-types/gat-in-trait-path-undeclared-lifetime.stderr
new file mode 100644
index 000000000..1792d8db2
--- /dev/null
+++ b/src/test/ui/generic-associated-types/gat-in-trait-path-undeclared-lifetime.stderr
@@ -0,0 +1,26 @@
+error[E0261]: use of undeclared lifetime name `'x`
+  --> $DIR/gat-in-trait-path-undeclared-lifetime.rs:8:35
+   |
+LL |   fn _f(arg : Box<dyn for<'a> X<Y<'x> = &'a [u32]>>) {}
+   |                                   ^^ undeclared lifetime
+   |
+   = note: for more information on higher-ranked polymorphism, visit https://doc.rust-lang.org/nomicon/hrtb.html
+help: consider making the bound lifetime-generic with a new `'x` lifetime
+   |
+LL |   fn _f(arg : Box<dyn for<'x, 'a> X<Y<'x> = &'a [u32]>>) {}
+   |                           +++
+help: consider introducing lifetime `'x` here
+   |
+LL |   fn _f<'x>(arg : Box<dyn for<'a> X<Y<'x> = &'a [u32]>>) {}
+   |        ++++
+
+error[E0582]: binding for associated type `Y` references lifetime `'a`, which does not appear in the trait input types
+  --> $DIR/gat-in-trait-path-undeclared-lifetime.rs:8:33
+   |
+LL |   fn _f(arg : Box<dyn for<'a> X<Y<'x> = &'a [u32]>>) {}
+   |                                 ^^^^^^^^^^^^^^^^^
+
+error: aborting due to 2 previous errors
+
+Some errors have detailed explanations: E0261, E0582.
+For more information about an error, try `rustc --explain E0261`.