Add tests for expect ident but find enum or struct panic

Closes #22589
Closes #22647
Closes #22665
Closes #22712

src/test/parse-fail/issue-22647.rs

@@ -0,0 +1,25 @@
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+fn main() {
+    let caller<F> = |f: F|  //~ ERROR unexpected token: `<`
+    where F: Fn() -> i32
+    {
+        let x = f();
+        println!("Y {}",x);
+        return x;
+    };
+
+    caller(bar_handler);
+}
+
+fn bar_handler() -> i32 {
+    5
+}

src/test/parse-fail/issue-22712.rs

@@ -0,0 +1,19 @@
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+struct Foo<B> {
+    buffer: B
+}
+
+fn bar() {
+    let Foo<Vec<u8>>  //~ ERROR unexpected token: `<`
+}
+
+fn main() {}