diff --git a/tests/expectations/va_list.c b/tests/expectations/va_list.c
index d2f9ac39..1e0b4663 100644
--- a/tests/expectations/va_list.c
+++ b/tests/expectations/va_list.c
@@ -3,6 +3,25 @@
 #include <stdint.h>
 #include <stdlib.h>
 
+typedef int32_t (*VaListFnPtr)(va_list);
+
+typedef int32_t (*VaListFnPtr2)(void);
+
+typedef struct {
+  int32_t (*fn1)(va_list);
+} Interface_______i32_______va_list;
+
+typedef struct {
+  int32_t (*fn1)(void);
+} Interface_______i32;
+
 int32_t va_list_test(va_list ap);
 
 int32_t va_list_test2(va_list ap);
+
+void va_list_fn_ptrs(int32_t (*fn1)(va_list),
+                     int32_t (*fn2)(void),
+                     VaListFnPtr fn3,
+                     VaListFnPtr2 fn4,
+                     Interface_______i32_______va_list fn5,
+                     Interface_______i32 fn6);
diff --git a/tests/expectations/va_list.compat.c b/tests/expectations/va_list.compat.c
index b6a444f0..40109bb4 100644
--- a/tests/expectations/va_list.compat.c
+++ b/tests/expectations/va_list.compat.c
@@ -3,6 +3,18 @@
 #include <stdint.h>
 #include <stdlib.h>
 
+typedef int32_t (*VaListFnPtr)(va_list);
+
+typedef int32_t (*VaListFnPtr2)(void);
+
+typedef struct {
+  int32_t (*fn1)(va_list);
+} Interface_______i32_______va_list;
+
+typedef struct {
+  int32_t (*fn1)(void);
+} Interface_______i32;
+
 #ifdef __cplusplus
 extern "C" {
 #endif // __cplusplus
@@ -11,6 +23,13 @@ int32_t va_list_test(va_list ap);
 
 int32_t va_list_test2(va_list ap);
 
+void va_list_fn_ptrs(int32_t (*fn1)(va_list),
+                     int32_t (*fn2)(void),
+                     VaListFnPtr fn3,
+                     VaListFnPtr2 fn4,
+                     Interface_______i32_______va_list fn5,
+                     Interface_______i32 fn6);
+
 #ifdef __cplusplus
 }  // extern "C"
 #endif  // __cplusplus
diff --git a/tests/expectations/va_list.cpp b/tests/expectations/va_list.cpp
index 79b32c85..8988f930 100644
--- a/tests/expectations/va_list.cpp
+++ b/tests/expectations/va_list.cpp
@@ -4,10 +4,26 @@
 #include <ostream>
 #include <new>
 
+using VaListFnPtr = int32_t(*)(va_list);
+
+using VaListFnPtr2 = int32_t(*)();
+
+template<typename T>
+struct Interface {
+  T fn1;
+};
+
 extern "C" {
 
 int32_t va_list_test(va_list ap);
 
 int32_t va_list_test2(va_list ap);
 
+void va_list_fn_ptrs(int32_t (*fn1)(va_list),
+                     int32_t (*fn2)(),
+                     VaListFnPtr fn3,
+                     VaListFnPtr2 fn4,
+                     Interface<int32_t(*)(va_list)> fn5,
+                     Interface<int32_t(*)()> fn6);
+
 }  // extern "C"
diff --git a/tests/expectations/va_list.pyx b/tests/expectations/va_list.pyx
index 4ce0c8d7..2b8edd48 100644
--- a/tests/expectations/va_list.pyx
+++ b/tests/expectations/va_list.pyx
@@ -6,6 +6,23 @@ cdef extern from *:
 
 cdef extern from *:
 
+  ctypedef int32_t (*VaListFnPtr)(va_list);
+
+  ctypedef int32_t (*VaListFnPtr2)();
+
+  ctypedef struct Interface_______i32_______va_list:
+    int32_t (*fn1)(va_list);
+
+  ctypedef struct Interface_______i32:
+    int32_t (*fn1)();
+
   int32_t va_list_test(va_list ap);
 
   int32_t va_list_test2(va_list ap);
+
+  void va_list_fn_ptrs(int32_t (*fn1)(va_list),
+                       int32_t (*fn2)(),
+                       VaListFnPtr fn3,
+                       VaListFnPtr2 fn4,
+                       Interface_______i32_______va_list fn5,
+                       Interface_______i32 fn6);
diff --git a/tests/expectations/va_list_both.c b/tests/expectations/va_list_both.c
new file mode 100644
index 00000000..8da67989
--- /dev/null
+++ b/tests/expectations/va_list_both.c
@@ -0,0 +1,27 @@
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+typedef int32_t (*VaListFnPtr)(va_list);
+
+typedef int32_t (*VaListFnPtr2)(void);
+
+typedef struct Interface_______i32_______va_list {
+  int32_t (*fn1)(va_list);
+} Interface_______i32_______va_list;
+
+typedef struct Interface_______i32 {
+  int32_t (*fn1)(void);
+} Interface_______i32;
+
+int32_t va_list_test(va_list ap);
+
+int32_t va_list_test2(va_list ap);
+
+void va_list_fn_ptrs(int32_t (*fn1)(va_list),
+                     int32_t (*fn2)(void),
+                     VaListFnPtr fn3,
+                     VaListFnPtr2 fn4,
+                     struct Interface_______i32_______va_list fn5,
+                     struct Interface_______i32 fn6);
diff --git a/tests/expectations/va_list_both.compat.c b/tests/expectations/va_list_both.compat.c
new file mode 100644
index 00000000..29895ded
--- /dev/null
+++ b/tests/expectations/va_list_both.compat.c
@@ -0,0 +1,35 @@
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+typedef int32_t (*VaListFnPtr)(va_list);
+
+typedef int32_t (*VaListFnPtr2)(void);
+
+typedef struct Interface_______i32_______va_list {
+  int32_t (*fn1)(va_list);
+} Interface_______i32_______va_list;
+
+typedef struct Interface_______i32 {
+  int32_t (*fn1)(void);
+} Interface_______i32;
+
+#ifdef __cplusplus
+extern "C" {
+#endif // __cplusplus
+
+int32_t va_list_test(va_list ap);
+
+int32_t va_list_test2(va_list ap);
+
+void va_list_fn_ptrs(int32_t (*fn1)(va_list),
+                     int32_t (*fn2)(void),
+                     VaListFnPtr fn3,
+                     VaListFnPtr2 fn4,
+                     struct Interface_______i32_______va_list fn5,
+                     struct Interface_______i32 fn6);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif  // __cplusplus
diff --git a/tests/expectations/va_list_tag.c b/tests/expectations/va_list_tag.c
new file mode 100644
index 00000000..1dc28cbb
--- /dev/null
+++ b/tests/expectations/va_list_tag.c
@@ -0,0 +1,27 @@
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+typedef int32_t (*VaListFnPtr)(va_list);
+
+typedef int32_t (*VaListFnPtr2)(void);
+
+struct Interface_______i32_______va_list {
+  int32_t (*fn1)(va_list);
+};
+
+struct Interface_______i32 {
+  int32_t (*fn1)(void);
+};
+
+int32_t va_list_test(va_list ap);
+
+int32_t va_list_test2(va_list ap);
+
+void va_list_fn_ptrs(int32_t (*fn1)(va_list),
+                     int32_t (*fn2)(void),
+                     VaListFnPtr fn3,
+                     VaListFnPtr2 fn4,
+                     struct Interface_______i32_______va_list fn5,
+                     struct Interface_______i32 fn6);
diff --git a/tests/expectations/va_list_tag.compat.c b/tests/expectations/va_list_tag.compat.c
new file mode 100644
index 00000000..ba2da4fa
--- /dev/null
+++ b/tests/expectations/va_list_tag.compat.c
@@ -0,0 +1,35 @@
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+typedef int32_t (*VaListFnPtr)(va_list);
+
+typedef int32_t (*VaListFnPtr2)(void);
+
+struct Interface_______i32_______va_list {
+  int32_t (*fn1)(va_list);
+};
+
+struct Interface_______i32 {
+  int32_t (*fn1)(void);
+};
+
+#ifdef __cplusplus
+extern "C" {
+#endif // __cplusplus
+
+int32_t va_list_test(va_list ap);
+
+int32_t va_list_test2(va_list ap);
+
+void va_list_fn_ptrs(int32_t (*fn1)(va_list),
+                     int32_t (*fn2)(void),
+                     VaListFnPtr fn3,
+                     VaListFnPtr2 fn4,
+                     struct Interface_______i32_______va_list fn5,
+                     struct Interface_______i32 fn6);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif  // __cplusplus
diff --git a/tests/expectations/va_list_tag.pyx b/tests/expectations/va_list_tag.pyx
new file mode 100644
index 00000000..5b7ccca4
--- /dev/null
+++ b/tests/expectations/va_list_tag.pyx
@@ -0,0 +1,28 @@
+from libc.stdint cimport int8_t, int16_t, int32_t, int64_t, intptr_t
+from libc.stdint cimport uint8_t, uint16_t, uint32_t, uint64_t, uintptr_t
+cdef extern from *:
+  ctypedef bint bool
+  ctypedef struct va_list
+
+cdef extern from *:
+
+  ctypedef int32_t (*VaListFnPtr)(va_list);
+
+  ctypedef int32_t (*VaListFnPtr2)();
+
+  cdef struct Interface_______i32_______va_list:
+    int32_t (*fn1)(va_list);
+
+  cdef struct Interface_______i32:
+    int32_t (*fn1)();
+
+  int32_t va_list_test(va_list ap);
+
+  int32_t va_list_test2(va_list ap);
+
+  void va_list_fn_ptrs(int32_t (*fn1)(va_list),
+                       int32_t (*fn2)(),
+                       VaListFnPtr fn3,
+                       VaListFnPtr2 fn4,
+                       Interface_______i32_______va_list fn5,
+                       Interface_______i32 fn6);
diff --git a/tests/rust/va_list.rs b/tests/rust/va_list.rs
index 13503dda..e57178eb 100644
--- a/tests/rust/va_list.rs
+++ b/tests/rust/va_list.rs
@@ -9,3 +9,22 @@ pub unsafe extern "C" fn va_list_test(mut ap: VaList) -> int32_t {
 pub unsafe extern "C" fn va_list_test2(mut ap: ...) -> int32_t {
     ap.arg()
 }
+
+type VaListFnPtr = Option<unsafe extern "C" fn(VaList) -> int32_t>;
+type VaListFnPtr2 = Option<unsafe extern "C" fn(...) -> int32_t>;
+
+#[repr(C)]
+struct Interface<T> {
+    fn1: T,
+}
+
+#[no_mangle]
+pub extern "C" fn va_list_fn_ptrs(
+    fn1: Option<unsafe extern "C" fn(VaList) -> int32_t>,
+    fn2: Option<unsafe extern "C" fn(...) -> int32_t>,
+    fn3: VaListFnPtr,
+    fn4: VaListFnPtr2,
+    fn5: Interface<Option<unsafe extern "C" fn(VaList) -> int32_t>>,
+    fn6: Interface<Option<unsafe extern "C" fn(...) -> int32_t>>,
+) {
+}