test cases: array inside of anonymous struct

Closes #7525

test/cases/array_in_anon_struct.zig

@@ -0,0 +1,21 @@
+const std = @import("std");
+
+noinline fn outer() u32 {
+    var a: u32 = 42;
+    return inner(.{
+        .unused = a,
+        .value = [1]u32{0},
+    });
+}
+
+noinline fn inner(args: anytype) u32 {
+    return args.value[0];
+}
+
+pub fn main() !void {
+    try std.testing.expect(outer() == 0);
+}
+
+// run
+// backend=llvm
+// target=native