2 files changed, 112 insertions, 0 deletions
diff --git a/tests/expectations/tests/func_return_must_use.rs b/tests/expectations/tests/func_return_must_use.rs
new file mode 100644
index 00000000..9f40aaa6
--- /dev/null
+++ b/tests/expectations/tests/func_return_must_use.rs
@@ -0,0 +1,76 @@
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
+
+pub type MustUseInt = ::std::os::raw::c_int;
+extern "C" {
+    #[must_use]
+    pub fn return_int() -> MustUseInt;
+}
+#[repr(C)]
+#[derive(Debug, Copy, Clone)]
+#[must_use]
+pub struct MustUseStruct {
+    _unused: [u8; 0],
+}
+extern "C" {
+    pub fn return_struct() -> MustUseStruct;
+}
+/// <div rustbindgen mustusetype></div>
+pub type AnnotatedInt = ::std::os::raw::c_int;
+extern "C" {
+    #[must_use]
+    pub fn return_annotated_int() -> AnnotatedInt;
+}
+extern "C" {
+    pub fn return_plain_int() -> ::std::os::raw::c_int;
+}
+/// <div rustbindgen mustusetype></div>
+#[repr(C)]
+#[derive(Debug, Default, Copy, Clone)]
+#[must_use]
+pub struct AnnotatedStruct {}
+#[test]
+fn bindgen_test_layout_AnnotatedStruct() {
+    assert_eq!(
+        ::std::mem::size_of::<AnnotatedStruct>(),
+        0usize,
+        concat!("Size of: ", stringify!(AnnotatedStruct))
+    );
+    assert_eq!(
+        ::std::mem::align_of::<AnnotatedStruct>(),
+        1usize,
+        concat!("Alignment of ", stringify!(AnnotatedStruct))
+    );
+}
+extern "C" {
+    pub fn return_annotated_struct() -> AnnotatedStruct;
+}
+#[repr(C)]
+#[derive(Debug, Default, Copy, Clone)]
+pub struct PlainStruct {}
+#[test]
+fn bindgen_test_layout_PlainStruct() {
+    assert_eq!(
+        ::std::mem::size_of::<PlainStruct>(),
+        0usize,
+        concat!("Size of: ", stringify!(PlainStruct))
+    );
+    assert_eq!(
+        ::std::mem::align_of::<PlainStruct>(),
+        1usize,
+        concat!("Alignment of ", stringify!(PlainStruct))
+    );
+}
+/// <div rustbindgen mustusetype></div>
+pub type TypedefPlainStruct = PlainStruct;
+extern "C" {
+    pub fn return_plain_struct() -> PlainStruct;
+}
+extern "C" {
+    #[must_use]
+    pub fn return_typedef_struct() -> TypedefPlainStruct;
+}
diff --git a/tests/headers/func_return_must_use.h b/tests/headers/func_return_must_use.h
new file mode 100644
index 00000000..f05bd2de
--- /dev/null
+++ b/tests/headers/func_return_must_use.h
@@ -0,0 +1,36 @@
+// bindgen-flags: --must-use-type 'MustUse.*'
+
+typedef int MustUseInt;
+
+MustUseInt return_int();
+
+struct MustUseStruct;
+
+struct MustUseStruct return_struct();
+
+/**
+ * <div rustbindgen mustusetype></div>
+ */
+typedef int AnnotatedInt;
+
+AnnotatedInt return_annotated_int();
+
+int return_plain_int();
+
+/**
+ * <div rustbindgen mustusetype></div>
+ */
+struct AnnotatedStruct {};
+
+struct AnnotatedStruct return_annotated_struct();
+
+struct PlainStruct {};
+
+/**
+ * <div rustbindgen mustusetype></div>
+ */
+typedef struct PlainStruct TypedefPlainStruct;
+
+struct PlainStruct return_plain_struct();
+
+TypedefPlainStruct return_typedef_struct();