1 files changed, 40 insertions, 0 deletions
diff --git a/src/test/ui/generic-associated-types/issue-78113-lifetime-mismatch-dyn-trait-box.rs b/src/test/ui/generic-associated-types/issue-78113-lifetime-mismatch-dyn-trait-box.rs
new file mode 100644
index 000000000..850d83be6
--- /dev/null
+++ b/src/test/ui/generic-associated-types/issue-78113-lifetime-mismatch-dyn-trait-box.rs
@@ -0,0 +1,40 @@
+// Test for diagnostics when we have mismatched lifetime due to implict 'static lifetime in GATs
+
+// check-fail
+
+#![feature(generic_associated_types)]
+
+pub trait A {}
+impl A for &dyn A {}
+impl A for Box<dyn A> {}
+
+pub trait B {
+    type T<'a>: A;
+}
+
+impl B for () {
+    // `'a` doesn't match implicit `'static`: suggest `'_`
+    type T<'a> = Box<dyn A + 'a>; //~ incompatible lifetime on type
+}
+
+trait C {}
+impl C for Box<dyn A + 'static> {}
+pub trait D {
+    type T<'a>: C;
+}
+impl D for () {
+    // `'a` doesn't match explicit `'static`: we *should* suggest removing `'static`
+    type T<'a> = Box<dyn A + 'a>; //~ incompatible lifetime on type
+}
+
+trait E {}
+impl E for (Box<dyn A>, Box<dyn A>) {}
+pub trait F {
+    type T<'a>: E;
+}
+impl F for () {
+    // `'a` doesn't match explicit `'static`: suggest `'_`
+    type T<'a> = (Box<dyn A + 'a>, Box<dyn A + 'a>); //~ incompatible lifetime on type
+}
+
+fn main() {}