1 files changed, 58 insertions, 0 deletions
diff --git a/src/test/ui/regions/regions-name-undeclared.rs b/src/test/ui/regions/regions-name-undeclared.rs
new file mode 100644
index 000000000..7b6ede193
--- /dev/null
+++ b/src/test/ui/regions/regions-name-undeclared.rs
@@ -0,0 +1,58 @@
+// edition:2018
+// Check that lifetime resolver enforces the lifetime name scoping
+// rules correctly in various scenarios.
+
+struct Foo<'a> {
+    x: &'a isize
+}
+
+impl<'a> Foo<'a> {
+    // &'a is inherited:
+    fn m1(&self, arg: &'a isize) { }
+    fn m2(&'a self) { }
+    fn m3(&self, arg: Foo<'a>) { }
+
+    // &'b is not:
+    fn m4(&self, arg: &'b isize) { } //~ ERROR undeclared lifetime
+    fn m5(&'b self) { } //~ ERROR undeclared lifetime
+    fn m6(&self, arg: Foo<'b>) { } //~ ERROR undeclared lifetime
+}
+
+fn bar<'a>(x: &'a isize) {
+    // &'a is visible to code:
+    let y: &'a isize = x;
+
+    // &'a is not visible to *items*:
+    type X = Option<&'a isize>; //~ ERROR can't use generic parameters from outer item
+    enum E {
+        E1(&'a isize) //~ ERROR can't use generic parameters from outer item
+    }
+    struct S {
+        f: &'a isize //~ ERROR can't use generic parameters from outer item
+    }
+    fn f(a: &'a isize) { } //~ ERROR can't use generic parameters from outer item
+
+    // &'a CAN be declared on functions and used then:
+    fn g<'a>(a: &'a isize) { } // OK
+    fn h(a: Box<dyn for<'a> FnOnce(&'a isize)>) { } // OK
+}
+
+// Test nesting of lifetimes in fn type declarations
+fn fn_types(a: &'a isize, //~ ERROR undeclared lifetime
+            b: Box<dyn for<'a> FnOnce(&'a isize,
+                                  &'b isize, //~ ERROR undeclared lifetime
+                                  Box<dyn for<'b> FnOnce(&'a isize,
+                                                     &'b isize)>,
+                                  &'b isize)>, //~ ERROR undeclared lifetime
+            c: &'a isize) //~ ERROR undeclared lifetime
+{
+}
+
+struct Bug {}
+impl Bug {
+    async fn buggy(&self) -> &'a str { //~ ERROR use of undeclared lifetime name `'a`
+        todo!()
+    }
+}
+
+pub fn main() {}