Add a test with both passing and erroneous cases.

2 files changed, 146 insertions, 0 deletions

diff --git a/src/test/ui/impl-trait/nested-rpit-hrtb.rs b/src/test/ui/impl-trait/nested-rpit-hrtb.rs
new file mode 100644
index 00000000000..1490e3fd787
--- /dev/null
+++ b/src/test/ui/impl-trait/nested-rpit-hrtb.rs
@@ -0,0 +1,66 @@
+// Test the interaction between rested RPIT and HRTB.
+
+trait Foo<'a> {
+    type Assoc;
+}
+
+impl Foo<'_> for () {
+    type Assoc = ();
+}
+
+// Alternative version of `Foo` whose impl uses `'a`.
+trait Bar<'a> {
+    type Assoc;
+}
+
+impl<'a> Bar<'a> for () {
+    type Assoc = &'a ();
+}
+
+trait Qux<'a> {}
+
+impl Qux<'_> for () {}
+
+// This is not supported.
+fn one_hrtb_outlives() -> impl for<'a> Foo<'a, Assoc = impl Sized + 'a> {}
+//~^ ERROR higher kinded lifetime bounds on nested opaque types are not supported yet
+
+// This is not supported.
+fn one_hrtb_trait_param() -> impl for<'a> Foo<'a, Assoc = impl Qux<'a>> {}
+//~^ ERROR higher kinded lifetime bounds on nested opaque types are not supported yet
+
+fn one_hrtb_outlives_uses() -> impl for<'a> Bar<'a, Assoc = impl Sized + 'a> {}
+//~^ ERROR higher kinded lifetime bounds on nested opaque types are not supported yet
+
+fn one_hrtb_trait_param_uses() -> impl for<'a> Bar<'a, Assoc = impl Qux<'a>> {}
+//~^ ERROR higher kinded lifetime bounds on nested opaque types are not supported yet
+
+// This should pass.
+fn one_hrtb_mention_fn_trait_param<'b>() -> impl for<'a> Foo<'a, Assoc = impl Qux<'b>> {}
+
+// This should pass.
+fn one_hrtb_mention_fn_outlives<'b>() -> impl for<'a> Foo<'a, Assoc = impl Sized + 'b> {}
+
+// This should pass.
+fn one_hrtb_mention_fn_trait_param_uses<'b>() -> impl for<'a> Bar<'a, Assoc = impl Qux<'b>> {}
+
+// This should pass.
+fn one_hrtb_mention_fn_outlives_uses<'b>() -> impl for<'a> Bar<'a, Assoc = impl Sized + 'b> {}
+
+// This should pass.
+fn two_htrb_trait_param() -> impl for<'a> Foo<'a, Assoc = impl for<'b> Qux<'b>> {}
+
+// `'b` is not in scope for the outlives bound.
+fn two_htrb_outlives() -> impl for<'a> Foo<'a, Assoc = impl for<'b> Sized + 'b> {}
+//~^ ERROR use of undeclared lifetime name `'b` [E0261]
+//~| ERROR lifetime name `'b` shadows a lifetime name that is already in scope [E0496]
+
+// This should pass.
+fn two_htrb_trait_param_uses() -> impl for<'a> Bar<'a, Assoc = impl for<'b> Qux<'b>> {}
+
+// `'b` is not in scope for the outlives bound.
+fn two_htrb_outlives_uses() -> impl for<'a> Bar<'a, Assoc = impl for<'b> Sized + 'b> {}
+//~^ ERROR use of undeclared lifetime name `'b` [E0261]
+//~| ERROR lifetime name `'b` shadows a lifetime name that is already in scope [E0496]
+
+fn main() {}
diff --git a/src/test/ui/impl-trait/nested-rpit-hrtb.stderr b/src/test/ui/impl-trait/nested-rpit-hrtb.stderr
new file mode 100644
index 00000000000..399f6fd9b4f
--- /dev/null
+++ b/src/test/ui/impl-trait/nested-rpit-hrtb.stderr
@@ -0,0 +1,80 @@
+error: higher kinded lifetime bounds on nested opaque types are not supported yet
+  --> $DIR/nested-rpit-hrtb.rs:25:69
+   |
+LL | fn one_hrtb_outlives() -> impl for<'a> Foo<'a, Assoc = impl Sized + 'a> {}
+   |                                                                     ^^
+   |
+note: lifetime declared here
+  --> $DIR/nested-rpit-hrtb.rs:25:36
+   |
+LL | fn one_hrtb_outlives() -> impl for<'a> Foo<'a, Assoc = impl Sized + 'a> {}
+   |                                    ^^
+
+error: higher kinded lifetime bounds on nested opaque types are not supported yet
+  --> $DIR/nested-rpit-hrtb.rs:29:68
+   |
+LL | fn one_hrtb_trait_param() -> impl for<'a> Foo<'a, Assoc = impl Qux<'a>> {}
+   |                                                                    ^^
+   |
+note: lifetime declared here
+  --> $DIR/nested-rpit-hrtb.rs:29:39
+   |
+LL | fn one_hrtb_trait_param() -> impl for<'a> Foo<'a, Assoc = impl Qux<'a>> {}
+   |                                       ^^
+
+error: higher kinded lifetime bounds on nested opaque types are not supported yet
+  --> $DIR/nested-rpit-hrtb.rs:32:74
+   |
+LL | fn one_hrtb_outlives_uses() -> impl for<'a> Bar<'a, Assoc = impl Sized + 'a> {}
+   |                                                                          ^^
+   |
+note: lifetime declared here
+  --> $DIR/nested-rpit-hrtb.rs:32:41
+   |
+LL | fn one_hrtb_outlives_uses() -> impl for<'a> Bar<'a, Assoc = impl Sized + 'a> {}
+   |                                         ^^
+
+error: higher kinded lifetime bounds on nested opaque types are not supported yet
+  --> $DIR/nested-rpit-hrtb.rs:35:73
+   |
+LL | fn one_hrtb_trait_param_uses() -> impl for<'a> Bar<'a, Assoc = impl Qux<'a>> {}
+   |                                                                         ^^
+   |
+note: lifetime declared here
+  --> $DIR/nested-rpit-hrtb.rs:35:44
+   |
+LL | fn one_hrtb_trait_param_uses() -> impl for<'a> Bar<'a, Assoc = impl Qux<'a>> {}
+   |                                            ^^
+
+error[E0261]: use of undeclared lifetime name `'b`
+  --> $DIR/nested-rpit-hrtb.rs:54:77
+   |
+LL | fn two_htrb_outlives() -> impl for<'a> Foo<'a, Assoc = impl for<'b> Sized + 'b> {}
+   |                     - help: consider introducing lifetime `'b` here: `<'b>` ^^ undeclared lifetime
+
+error[E0496]: lifetime name `'b` shadows a lifetime name that is already in scope
+  --> $DIR/nested-rpit-hrtb.rs:54:65
+   |
+LL | fn two_htrb_outlives() -> impl for<'a> Foo<'a, Assoc = impl for<'b> Sized + 'b> {}
+   |                                                                 ^^          -- first declared here
+   |                                                                 |
+   |                                                                 lifetime `'b` already in scope
+
+error[E0261]: use of undeclared lifetime name `'b`
+  --> $DIR/nested-rpit-hrtb.rs:62:82
+   |
+LL | fn two_htrb_outlives_uses() -> impl for<'a> Bar<'a, Assoc = impl for<'b> Sized + 'b> {}
+   |                          - help: consider introducing lifetime `'b` here: `<'b>` ^^ undeclared lifetime
+
+error[E0496]: lifetime name `'b` shadows a lifetime name that is already in scope
+  --> $DIR/nested-rpit-hrtb.rs:62:70
+   |
+LL | fn two_htrb_outlives_uses() -> impl for<'a> Bar<'a, Assoc = impl for<'b> Sized + 'b> {}
+   |                                                                      ^^          -- first declared here
+   |                                                                      |
+   |                                                                      lifetime `'b` already in scope
+
+error: aborting due to 8 previous errors
+
+Some errors have detailed explanations: E0261, E0496.
+For more information about an error, try `rustc --explain E0261`.