Rollup merge of #33870 - jseyfried:ice-issue-33569, r=pnkfelix

Fix ICE on parsing a bad metavariable in a macro definition

Fixes #33569, fixes #33728.
r? @pnkfelix

src/test/parse-fail/issue-33569.rs

@@ -0,0 +1,18 @@
+// Copyright 2016 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.
+
+// compile-flags: -Z no-analysis
+
+macro_rules! foo {
+    { $+ } => { //~ ERROR expected identifier, found `+`
+        $(x)(y) //~ ERROR expected `*` or `+`
+                //~^ ERROR no rules expected the token `y`
+    }
+}