[gcc/devel/rust/master] Add testcase to show forward declared items work

[Thomas Schwinge]

https://gcc.gnu.org/g:6cae31a09ec64f4536d70f6d630e50f0543da363

commit 6cae31a09ec64f4536d70f6d630e50f0543da363
Author: Philip Herron <philip.herron@embecosm.com>
Date:   Tue Sep 27 08:56:16 2022 +0100

    Add testcase to show forward declared items work
    
    Fixes #1006

Diff:
---
 gcc/testsuite/rust/compile/issue-1006.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/gcc/testsuite/rust/compile/issue-1006.rs b/gcc/testsuite/rust/compile/issue-1006.rs
new file mode 100644
index 00000000000..7f565deaef3
--- /dev/null
+++ b/gcc/testsuite/rust/compile/issue-1006.rs
@@ -0,0 +1,10 @@
+// { dg-options "-w" }
+union B {
+    a: A,
+    b: f32,
+}
+
+struct A {
+    data: i32,
+    len: usize,
+}