1 files changed, 52 insertions, 0 deletions
diff --git a/src/test/ui/nll/ty-outlives/wf-unreachable.rs b/src/test/ui/nll/ty-outlives/wf-unreachable.rs
new file mode 100644
index 000000000..c6f4c4afa
--- /dev/null
+++ b/src/test/ui/nll/ty-outlives/wf-unreachable.rs
@@ -0,0 +1,52 @@
+// Test that we check that user type annotations are well-formed, even in dead
+// code.
+
+fn uninit<'a>() {
+    return;
+    let x: &'static &'a ();                         //~ ERROR lifetime may not live long enough
+}
+
+fn var_type<'a>() {
+    return;
+    let x: &'static &'a () = &&();                  //~ ERROR lifetime may not live long enough
+}
+
+fn uninit_infer<'a>() {
+    let x: &'static &'a _;                          //~ ERROR lifetime may not live long enough
+    x = && ();
+}
+
+fn infer<'a>() {
+    return;
+    let x: &'static &'a _ = &&();                   //~ ERROR lifetime may not live long enough
+}
+
+fn uninit_no_var<'a>() {
+    return;
+    let _: &'static &'a ();                         //~ ERROR lifetime may not live long enough
+}
+
+fn no_var<'a>() {
+    return;
+    let _: &'static &'a () = &&();                  //~ ERROR lifetime may not live long enough
+}
+
+fn infer_no_var<'a>() {
+    return;
+    let _: &'static &'a _ = &&();                   //~ ERROR lifetime may not live long enough
+}
+
+trait X<'a, 'b> {}
+
+struct C<'a, 'b, T: X<'a, 'b>>(T, &'a (), &'b ());
+
+impl X<'_, '_> for i32 {}
+impl<'a> X<'a, 'a> for () {}
+
+// This type annotation is not well-formed because we substitute `()` for `_`.
+fn required_substs<'a>() {
+    return;
+    let _: C<'static, 'a, _> = C((), &(), &());     //~ ERROR lifetime may not live long enough
+}
+
+fn main() {}