Add test for pretty printing anonymous types

src/test/pretty/anonymous-types.rs

@@ -0,0 +1,24 @@
+// Test for issue 85480
+// Pretty print anonymous struct and union types
+
+// pp-exact
+// pretty-compare-only
+
+struct Foo {
+    _: union {
+           _: struct {
+                  a: u8,
+                  b: u16,
+              },
+           c: u32,
+       },
+    d: u64,
+    e: f32,
+}
+
+type A =
+ struct {
+     field: u8,
+ };
+
+fn main() { }