fix(ctest): cast fn pointers as *const ()

Author: JohnTitor

ctest/templates/test.rs

@@ -341,7 +341,7 @@ mod generated_tests {
             fn ctest_foreign_fn__{{ item.id }}() -> unsafe extern "C" fn();
         }
         let actual = unsafe { ctest_foreign_fn__{{ item.id }}() } as u64;
-        let expected = {{ item.id }} as u64;
+        let expected = {{ item.id }} as *const () as u64;
         check_same(actual, expected, "`{{ item.id }}` function pointer");
     }
 {%- endfor +%}

ctest/tests/input/hierarchy.out.rs

@@ -238,7 +238,7 @@ mod generated_tests {
             fn ctest_foreign_fn__malloc() -> unsafe extern "C" fn();
         }
         let actual = unsafe { ctest_foreign_fn__malloc() } as u64;
-        let expected = malloc as u64;
+        let expected = malloc as *const () as u64;
         check_same(actual, expected, "`malloc` function pointer");
     }
 

ctest/tests/input/simple.out.with-renames.rs

@@ -1179,7 +1179,7 @@ mod generated_tests {
             fn ctest_foreign_fn__calloc() -> unsafe extern "C" fn();
         }
         let actual = unsafe { ctest_foreign_fn__calloc() } as u64;
-        let expected = calloc as u64;
+        let expected = calloc as *const () as u64;
         check_same(actual, expected, "`calloc` function pointer");
     }