Auto merge of #29409 - arielb1:recursive-arrays, r=eddyb

when evaluating a recursive type, the `type_of` of the interior could be
still in progress, so trying to get its size would cause an ICE.

Fixes #19001

r? @eddyb

src/test/run-pass/issue-19001.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.
+
+// check that we handle recursive arrays correctly in `type_of`
+
+struct Loopy {
+    ptr: *mut [Loopy; 1]
+}
+
+fn main() {
+    let _t = Loopy { ptr: 0 as *mut _ };
+}