Added test for forward declared complex types

Author: nikhilshagri

tests/expectations/tests/forward_declared_complex_types.rs

@@ -0,0 +1,37 @@
+/* automatically generated by rust-bindgen */
+
+
+#![allow(non_snake_case)]
+
+
+#[repr(C)]
+pub struct Foo([u8; 0]);
+#[repr(C)]
+#[derive(Debug, Copy)]
+pub struct Bar {
+    pub f: *mut Foo,
+}
+#[test]
+fn bindgen_test_layout_Bar() {
+    assert_eq!(::std::mem::size_of::<Bar>() , 8usize);
+    assert_eq!(::std::mem::align_of::<Bar>() , 8usize);
+}
+impl Clone for Bar {
+    fn clone(&self) -> Self { *self }
+}
+extern "C" {
+    #[link_name = "_Z10baz_structP3Foo"]
+    pub fn baz_struct(f: *mut Foo);
+}
+#[repr(C)]
+pub struct Union([u8; 0]);
+extern "C" {
+    #[link_name = "_Z9baz_unionP5Union"]
+    pub fn baz_union(u: *mut Union);
+}
+#[repr(C)]
+pub struct Quux([u8; 0]);
+extern "C" {
+    #[link_name = "_Z9baz_classP4Quux"]
+    pub fn baz_class(q: *mut Quux);
+}

tests/headers/forward_declared_complex_types.hpp

@@ -0,0 +1,15 @@
+struct Foo;
+
+struct Bar {
+    Foo *f;
+};
+
+void baz_struct(Foo* f);
+
+union Union;
+
+void baz_union(Union* u);
+
+class Quux;
+
+void baz_class(Quux* q);