Add more regression tests

src/test/ui/async-await/issue-54239-private-type-triggers-lint.rs

@@ -0,0 +1,17 @@
+// Regression test for #54239, shouldn't trigger lint.
+// check-pass
+// edition:2018
+
+#![deny(missing_debug_implementations)]
+
+struct DontLookAtMe(i32);
+
+async fn secret() -> DontLookAtMe {
+    DontLookAtMe(41)
+}
+
+pub async fn looking() -> i32 { // Shouldn't trigger lint here.
+    secret().await.0
+}
+
+fn main() {}

src/test/ui/generator/issue-64620-yield-array-element.rs

@@ -0,0 +1,9 @@
+// Regression test for #64620
+
+#![feature(generators)]
+
+pub fn crash(arr: [usize; 1]) {
+    yield arr[0]; //~ ERROR: yield expression outside of generator literal
+}
+
+fn main() {}

src/test/ui/generator/issue-64620-yield-array-element.stderr

@@ -0,0 +1,9 @@
+error[E0627]: yield expression outside of generator literal
+  --> $DIR/issue-64620-yield-array-element.rs:6:5
+   |
+LL |     yield arr[0];
+   |     ^^^^^^^^^^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0627`.

src/test/ui/impl-trait/issue-57200.rs

@@ -0,0 +1,14 @@
+// Regression test for #57200
+
+#![feature(impl_trait_in_bindings)]
+#![allow(incomplete_features)]
+
+fn bug<'a, 'b, T>()
+where
+    'a: 'b,
+{
+    let f: impl Fn(&'a T) -> &'b T = |x| x;
+    //~^ ERROR: lifetimes in impl Trait types in bindings are not currently supported
+}
+
+fn main() {}

src/test/ui/impl-trait/issue-57200.stderr

@@ -0,0 +1,8 @@
+error: lifetimes in impl Trait types in bindings are not currently supported
+  --> $DIR/issue-57200.rs:10:12
+   |
+LL |     let f: impl Fn(&'a T) -> &'b T = |x| x;
+   |            ^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+

src/test/ui/impl-trait/issue-57201.rs

@@ -0,0 +1,14 @@
+// Regression test for #57201
+
+#![feature(impl_trait_in_bindings)]
+#![allow(incomplete_features)]
+
+fn bug<'a, 'b, T>()
+where
+    'a: 'b,
+{
+    let f: &impl Fn(&'a T) -> &'b T = &|x| x;
+    //~^ ERROR: lifetimes in impl Trait types in bindings are not currently supported
+}
+
+fn main() {}

src/test/ui/impl-trait/issue-57201.stderr

@@ -0,0 +1,8 @@
+error: lifetimes in impl Trait types in bindings are not currently supported
+  --> $DIR/issue-57201.rs:10:13
+   |
+LL |     let f: &impl Fn(&'a T) -> &'b T = &|x| x;
+   |             ^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+

src/test/ui/impl-trait/issue-60473.rs

@@ -0,0 +1,16 @@
+// Regression test for #60473
+
+#![feature(impl_trait_in_bindings)]
+#![allow(incomplete_features)]
+
+struct A<'a>(&'a ());
+
+trait Trait<T> {
+}
+
+impl<T> Trait<T> for () {
+}
+
+fn main() {
+    let x: impl Trait<A> = (); //~ ERROR: opaque type expands to a recursive type
+}

src/test/ui/impl-trait/issue-60473.stderr

@@ -0,0 +1,11 @@
+error[E0720]: opaque type expands to a recursive type
+  --> $DIR/issue-60473.rs:15:12
+   |
+LL |     let x: impl Trait<A> = ();
+   |            ^^^^^^^^^^^^^ expands to a recursive type
+   |
+   = note: type resolves to itself
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0720`.

src/test/ui/impl-trait/issue-67166.rs

@@ -0,0 +1,11 @@
+// Regression test for #67166
+
+#![feature(impl_trait_in_bindings)]
+#![allow(incomplete_features)]
+
+pub fn run() {
+    let _foo: Box<impl Copy + '_> = Box::new(());
+    //~^ ERROR: opaque type expands to a recursive type
+}
+
+fn main() {}

src/test/ui/impl-trait/issue-67166.stderr

@@ -0,0 +1,11 @@
+error[E0720]: opaque type expands to a recursive type
+  --> $DIR/issue-67166.rs:7:19
+   |
+LL |     let _foo: Box<impl Copy + '_> = Box::new(());
+   |                   ^^^^^^^^^^^^^^ expands to a recursive type
+   |
+   = note: type resolves to itself
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0720`.