1 files changed, 645 insertions, 0 deletions
diff --git a/vendor/wasm-bindgen/tests/wasm/closures.rs b/vendor/wasm-bindgen/tests/wasm/closures.rs
new file mode 100644
index 000000000..dc88b43ad
--- /dev/null
+++ b/vendor/wasm-bindgen/tests/wasm/closures.rs
@@ -0,0 +1,645 @@
+use js_sys::Number;
+use std::cell::{Cell, RefCell};
+use std::rc::Rc;
+use wasm_bindgen::prelude::*;
+use wasm_bindgen_test::*;
+
+#[wasm_bindgen(module = "tests/wasm/closures.js")]
+extern "C" {
+    fn works_call(a: &dyn Fn());
+    fn works_thread(a: &dyn Fn(u32) -> u32) -> u32;
+
+    fn cannot_reuse_call(a: &dyn Fn());
+    #[wasm_bindgen(catch)]
+    fn cannot_reuse_call_again() -> Result<(), JsValue>;
+
+    fn long_lived_call1(a: &Closure<dyn Fn()>);
+    fn long_lived_call2(a: &Closure<dyn FnMut(u32) -> u32>) -> u32;
+
+    fn many_arity_call1(a: &Closure<dyn Fn()>);
+    fn many_arity_call2(a: &Closure<dyn Fn(u32)>);
+    fn many_arity_call3(a: &Closure<dyn Fn(u32, u32)>);
+    fn many_arity_call4(a: &Closure<dyn Fn(u32, u32, u32)>);
+    fn many_arity_call5(a: &Closure<dyn Fn(u32, u32, u32, u32)>);
+    fn many_arity_call6(a: &Closure<dyn Fn(u32, u32, u32, u32, u32)>);
+    fn many_arity_call7(a: &Closure<dyn Fn(u32, u32, u32, u32, u32, u32)>);
+    fn many_arity_call8(a: &Closure<dyn Fn(u32, u32, u32, u32, u32, u32, u32)>);
+    fn many_arity_call9(a: &Closure<dyn Fn(u32, u32, u32, u32, u32, u32, u32, u32)>);
+
+    #[wasm_bindgen(js_name = many_arity_call1)]
+    fn many_arity_call_mut1(a: &Closure<dyn FnMut()>);
+    #[wasm_bindgen(js_name = many_arity_call2)]
+    fn many_arity_call_mut2(a: &Closure<dyn FnMut(u32)>);
+    #[wasm_bindgen(js_name = many_arity_call3)]
+    fn many_arity_call_mut3(a: &Closure<dyn FnMut(u32, u32)>);
+    #[wasm_bindgen(js_name = many_arity_call4)]
+    fn many_arity_call_mut4(a: &Closure<dyn FnMut(u32, u32, u32)>);
+    #[wasm_bindgen(js_name = many_arity_call5)]
+    fn many_arity_call_mut5(a: &Closure<dyn FnMut(u32, u32, u32, u32)>);
+    #[wasm_bindgen(js_name = many_arity_call6)]
+    fn many_arity_call_mut6(a: &Closure<dyn FnMut(u32, u32, u32, u32, u32)>);
+    #[wasm_bindgen(js_name = many_arity_call7)]
+    fn many_arity_call_mut7(a: &Closure<dyn FnMut(u32, u32, u32, u32, u32, u32)>);
+    #[wasm_bindgen(js_name = many_arity_call8)]
+    fn many_arity_call_mut8(a: &Closure<dyn FnMut(u32, u32, u32, u32, u32, u32, u32)>);
+    #[wasm_bindgen(js_name = many_arity_call9)]
+    fn many_arity_call_mut9(a: &Closure<dyn FnMut(u32, u32, u32, u32, u32, u32, u32, u32)>);
+
+    fn option_call1(a: Option<&Closure<dyn Fn()>>);
+    fn option_call2(a: Option<&Closure<dyn FnMut(u32) -> u32>>) -> u32;
+    fn option_call3(a: Option<&Closure<dyn Fn()>>) -> bool;
+
+    #[wasm_bindgen(js_name = many_arity_call1)]
+    fn many_arity_stack1(a: &dyn Fn());
+    #[wasm_bindgen(js_name = many_arity_call2)]
+    fn many_arity_stack2(a: &dyn Fn(u32));
+    #[wasm_bindgen(js_name = many_arity_call3)]
+    fn many_arity_stack3(a: &dyn Fn(u32, u32));
+    #[wasm_bindgen(js_name = many_arity_call4)]
+    fn many_arity_stack4(a: &dyn Fn(u32, u32, u32));
+    #[wasm_bindgen(js_name = many_arity_call5)]
+    fn many_arity_stack5(a: &dyn Fn(u32, u32, u32, u32));
+    #[wasm_bindgen(js_name = many_arity_call6)]
+    fn many_arity_stack6(a: &dyn Fn(u32, u32, u32, u32, u32));
+    #[wasm_bindgen(js_name = many_arity_call7)]
+    fn many_arity_stack7(a: &dyn Fn(u32, u32, u32, u32, u32, u32));
+    #[wasm_bindgen(js_name = many_arity_call8)]
+    fn many_arity_stack8(a: &dyn Fn(u32, u32, u32, u32, u32, u32, u32));
+    #[wasm_bindgen(js_name = many_arity_call9)]
+    fn many_arity_stack9(a: &dyn Fn(u32, u32, u32, u32, u32, u32, u32, u32));
+
+    fn long_lived_dropping_cache(a: &Closure<dyn Fn()>);
+    #[wasm_bindgen(catch)]
+    fn long_lived_dropping_call() -> Result<(), JsValue>;
+
+    fn long_lived_option_dropping_cache(a: Option<&Closure<dyn Fn()>>) -> bool;
+    #[wasm_bindgen(catch)]
+    fn long_lived_option_dropping_call() -> Result<(), JsValue>;
+
+    fn long_fnmut_recursive_cache(a: &Closure<dyn FnMut()>);
+    #[wasm_bindgen(catch)]
+    fn long_fnmut_recursive_call() -> Result<(), JsValue>;
+
+    fn fnmut_call(a: &mut dyn FnMut());
+    fn fnmut_thread(a: &mut dyn FnMut(u32) -> u32) -> u32;
+
+    fn fnmut_bad_call(a: &mut dyn FnMut());
+    #[wasm_bindgen(catch)]
+    fn fnmut_bad_again(a: bool) -> Result<(), JsValue>;
+
+    fn string_arguments_call(a: &mut dyn FnMut(String));
+
+    fn string_ret_call(a: &mut dyn FnMut(String) -> String);
+
+    fn drop_during_call_save(a: &Closure<dyn Fn()>);
+    fn drop_during_call_call();
+
+    fn js_test_closure_returner();
+
+    fn calling_it_throws(a: &Closure<dyn FnMut()>) -> bool;
+
+    fn call_val(f: &JsValue);
+
+    #[wasm_bindgen(js_name = calling_it_throws)]
+    fn call_val_throws(f: &JsValue) -> bool;
+
+    fn pass_reference_first_arg_twice(
+        a: RefFirstArgument,
+        b: &Closure<dyn FnMut(&RefFirstArgument)>,
+        c: &Closure<dyn FnMut(&RefFirstArgument)>,
+    );
+    #[wasm_bindgen(js_name = pass_reference_first_arg_twice)]
+    fn pass_reference_first_arg_twice2(
+        a: RefFirstArgument,
+        b: &mut dyn FnMut(&RefFirstArgument),
+        c: &mut dyn FnMut(&RefFirstArgument),
+    );
+    fn call_destroyed(a: &JsValue);
+
+    fn js_store_forgotten_closure(closure: &Closure<dyn Fn()>);
+    fn js_call_forgotten_closure();
+
+    #[wasm_bindgen(js_name = many_arity_call2)]
+    fn externref_call(a: &Closure<dyn Fn(JsValue)>);
+    #[wasm_bindgen(js_name = many_arity_call2)]
+    fn named_externref_call(a: &Closure<dyn Fn(Number)>);
+}
+
+#[wasm_bindgen_test]
+fn works() {
+    let a = Cell::new(false);
+    works_call(&|| a.set(true));
+    assert!(a.get());
+
+    assert_eq!(works_thread(&|a| a + 1), 3);
+}
+
+#[wasm_bindgen_test]
+fn cannot_reuse() {
+    cannot_reuse_call(&|| {});
+    assert!(cannot_reuse_call_again().is_err());
+}
+
+#[wasm_bindgen_test]
+fn debug() {
+    let closure = Closure::wrap(Box::new(|| {}) as Box<dyn FnMut()>);
+    assert_eq!(&format!("{:?}", closure), "Closure { ... }");
+}
+
+#[wasm_bindgen_test]
+fn long_lived() {
+    let hit = Rc::new(Cell::new(false));
+    let hit2 = hit.clone();
+    let a = Closure::new(move || hit2.set(true));
+    assert!(!hit.get());
+    long_lived_call1(&a);
+    assert!(hit.get());
+
+    let hit = Rc::new(Cell::new(false));
+    {
+        let hit = hit.clone();
+        let a = Closure::new(move |x| {
+            hit.set(true);
+            x + 3
+        });
+        assert_eq!(long_lived_call2(&a), 5);
+    }
+    assert!(hit.get());
+}
+
+#[wasm_bindgen_test]
+fn many_arity() {
+    many_arity_call1(&Closure::new(|| {}));
+    many_arity_call2(&Closure::new(|a| assert_eq!(a, 1)));
+    many_arity_call3(&Closure::new(|a, b| assert_eq!((a, b), (1, 2))));
+    many_arity_call4(&Closure::new(|a, b, c| assert_eq!((a, b, c), (1, 2, 3))));
+    many_arity_call5(&Closure::new(|a, b, c, d| {
+        assert_eq!((a, b, c, d), (1, 2, 3, 4))
+    }));
+    many_arity_call6(&Closure::new(|a, b, c, d, e| {
+        assert_eq!((a, b, c, d, e), (1, 2, 3, 4, 5))
+    }));
+    many_arity_call7(&Closure::new(|a, b, c, d, e, f| {
+        assert_eq!((a, b, c, d, e, f), (1, 2, 3, 4, 5, 6))
+    }));
+    many_arity_call8(&Closure::new(|a, b, c, d, e, f, g| {
+        assert_eq!((a, b, c, d, e, f, g), (1, 2, 3, 4, 5, 6, 7))
+    }));
+    many_arity_call9(&Closure::new(|a, b, c, d, e, f, g, h| {
+        assert_eq!((a, b, c, d, e, f, g, h), (1, 2, 3, 4, 5, 6, 7, 8))
+    }));
+
+    let s = String::new();
+    many_arity_call_mut1(&Closure::once(move || drop(s)));
+    let s = String::new();
+    many_arity_call_mut2(&Closure::once(move |a| {
+        drop(s);
+        assert_eq!(a, 1);
+    }));
+    let s = String::new();
+    many_arity_call_mut3(&Closure::once(move |a, b| {
+        drop(s);
+        assert_eq!((a, b), (1, 2));
+    }));
+    let s = String::new();
+    many_arity_call_mut4(&Closure::once(move |a, b, c| {
+        drop(s);
+        assert_eq!((a, b, c), (1, 2, 3));
+    }));
+    let s = String::new();
+    many_arity_call_mut5(&Closure::once(move |a, b, c, d| {
+        drop(s);
+        assert_eq!((a, b, c, d), (1, 2, 3, 4));
+    }));
+    let s = String::new();
+    many_arity_call_mut6(&Closure::once(move |a, b, c, d, e| {
+        drop(s);
+        assert_eq!((a, b, c, d, e), (1, 2, 3, 4, 5));
+    }));
+    let s = String::new();
+    many_arity_call_mut7(&Closure::once(move |a, b, c, d, e, f| {
+        drop(s);
+        assert_eq!((a, b, c, d, e, f), (1, 2, 3, 4, 5, 6));
+    }));
+    let s = String::new();
+    many_arity_call_mut8(&Closure::once(move |a, b, c, d, e, f, g| {
+        drop(s);
+        assert_eq!((a, b, c, d, e, f, g), (1, 2, 3, 4, 5, 6, 7));
+    }));
+    let s = String::new();
+    many_arity_call_mut9(&Closure::once(move |a, b, c, d, e, f, g, h| {
+        drop(s);
+        assert_eq!((a, b, c, d, e, f, g, h), (1, 2, 3, 4, 5, 6, 7, 8));
+    }));
+
+    many_arity_stack1(&(|| {}));
+    many_arity_stack2(&(|a| assert_eq!(a, 1)));
+    many_arity_stack3(&(|a, b| assert_eq!((a, b), (1, 2))));
+    many_arity_stack4(&(|a, b, c| assert_eq!((a, b, c), (1, 2, 3))));
+    many_arity_stack5(&(|a, b, c, d| assert_eq!((a, b, c, d), (1, 2, 3, 4))));
+    many_arity_stack6(&(|a, b, c, d, e| assert_eq!((a, b, c, d, e), (1, 2, 3, 4, 5))));
+    many_arity_stack7(&(|a, b, c, d, e, f| assert_eq!((a, b, c, d, e, f), (1, 2, 3, 4, 5, 6))));
+    many_arity_stack8(
+        &(|a, b, c, d, e, f, g| assert_eq!((a, b, c, d, e, f, g), (1, 2, 3, 4, 5, 6, 7))),
+    );
+    many_arity_stack9(
+        &(|a, b, c, d, e, f, g, h| assert_eq!((a, b, c, d, e, f, g, h), (1, 2, 3, 4, 5, 6, 7, 8))),
+    );
+}
+
+#[wasm_bindgen_test]
+fn option() {
+    let hit = Rc::new(Cell::new(false));
+    let hit2 = hit.clone();
+    let a = Closure::new(move || hit2.set(true));
+    assert!(!hit.get());
+    option_call1(Some(&a));
+    assert!(hit.get());
+
+    let hit = Rc::new(Cell::new(false));
+    {
+        let hit = hit.clone();
+        let a = Closure::new(move |x| {
+            hit.set(true);
+            x + 3
+        });
+        assert_eq!(option_call2(Some(&a)), 5);
+    }
+    assert!(hit.get());
+
+    assert!(option_call3(None));
+}
+
+struct Dropper(Rc<Cell<bool>>);
+impl Drop for Dropper {
+    fn drop(&mut self) {
+        assert!(!self.0.get());
+        self.0.set(true);
+    }
+}
+
+#[wasm_bindgen_test]
+fn call_fn_once_twice() {
+    let dropped = Rc::new(Cell::new(false));
+    let dropper = Dropper(dropped.clone());
+    let called = Rc::new(Cell::new(false));
+
+    let c = Closure::once({
+        let called = called.clone();
+        move || {
+            assert!(!called.get());
+            called.set(true);
+            drop(dropper);
+        }
+    });
+
+    many_arity_call_mut1(&c);
+    assert!(called.get());
+    assert!(dropped.get());
+
+    assert!(calling_it_throws(&c));
+}
+
+#[wasm_bindgen_test]
+fn once_into_js() {
+    let dropped = Rc::new(Cell::new(false));
+    let dropper = Dropper(dropped.clone());
+    let called = Rc::new(Cell::new(false));
+
+    let f = Closure::once_into_js({
+        let called = called.clone();
+        move || {
+            assert!(!called.get());
+            called.set(true);
+            drop(dropper);
+        }
+    });
+
+    call_val(&f);
+    assert!(called.get());
+    assert!(dropped.get());
+
+    assert!(call_val_throws(&f));
+}
+
+#[wasm_bindgen_test]
+fn long_lived_dropping() {
+    let hit = Rc::new(Cell::new(false));
+    let hit2 = hit.clone();
+    let a = Closure::new(move || hit2.set(true));
+    long_lived_dropping_cache(&a);
+    assert!(!hit.get());
+    assert!(long_lived_dropping_call().is_ok());
+    assert!(hit.get());
+    drop(a);
+    assert!(long_lived_dropping_call().is_err());
+}
+
+#[wasm_bindgen_test]
+fn long_lived_option_dropping() {
+    let hit = Rc::new(Cell::new(false));
+    let hit2 = hit.clone();
+
+    let a = Closure::new(move || hit2.set(true));
+
+    assert!(!long_lived_option_dropping_cache(None));
+    assert!(long_lived_option_dropping_cache(Some(&a)));
+
+    assert!(!hit.get());
+    assert!(long_lived_option_dropping_call().is_ok());
+    assert!(hit.get());
+
+    drop(a);
+    assert!(long_lived_option_dropping_call().is_err());
+}
+
+#[wasm_bindgen_test]
+fn long_fnmut_recursive() {
+    let a = Closure::new(|| {
+        assert!(long_fnmut_recursive_call().is_err());
+    });
+    long_fnmut_recursive_cache(&a);
+    assert!(long_fnmut_recursive_call().is_ok());
+}
+
+#[wasm_bindgen_test]
+fn fnmut() {
+    let mut a = false;
+    fnmut_call(&mut || a = true);
+    assert!(a);
+
+    let mut x = false;
+    assert_eq!(
+        fnmut_thread(&mut |a| {
+            x = true;
+            a + 1
+        }),
+        3
+    );
+    assert!(x);
+}
+
+#[wasm_bindgen_test]
+fn fnmut_bad() {
+    let mut x = true;
+    let mut hits = 0;
+    fnmut_bad_call(&mut || {
+        hits += 1;
+        if fnmut_bad_again(hits == 1).is_err() {
+            return;
+        }
+        x = false;
+    });
+    assert_eq!(hits, 1);
+    assert!(x);
+
+    assert!(fnmut_bad_again(true).is_err());
+}
+
+#[wasm_bindgen_test]
+fn string_arguments() {
+    let mut x = false;
+    string_arguments_call(&mut |s| {
+        assert_eq!(s, "foo");
+        x = true;
+    });
+    assert!(x);
+}
+
+#[wasm_bindgen_test]
+fn string_ret() {
+    let mut x = false;
+    string_ret_call(&mut |mut s| {
+        assert_eq!(s, "foo");
+        s.push_str("bar");
+        x = true;
+        s
+    });
+    assert!(x);
+}
+
+#[wasm_bindgen_test]
+fn drop_drops() {
+    static mut HIT: bool = false;
+
+    struct A;
+
+    impl Drop for A {
+        fn drop(&mut self) {
+            unsafe {
+                HIT = true;
+            }
+        }
+    }
+    let a = A;
+    let x: Closure<dyn Fn()> = Closure::new(move || drop(&a));
+    drop(x);
+    unsafe {
+        assert!(HIT);
+    }
+}
+
+#[wasm_bindgen_test]
+fn drop_during_call_ok() {
+    static mut HIT: bool = false;
+    struct A;
+    impl Drop for A {
+        fn drop(&mut self) {
+            unsafe {
+                HIT = true;
+            }
+        }
+    }
+
+    let rc = Rc::new(RefCell::new(None));
+    let rc2 = rc.clone();
+    let x = 3;
+    let a = A;
+    let x: Closure<dyn Fn()> = Closure::new(move || {
+        // "drop ourselves"
+        drop(rc2.borrow_mut().take().unwrap());
+
+        // `A` should not have been destroyed as a result
+        unsafe {
+            assert!(!HIT);
+        }
+
+        // allocate some heap memory to try to paper over our `3`
+        drop(String::from("1234567890"));
+
+        // make sure our closure memory is still valid
+        assert_eq!(x, 3);
+
+        // make sure `A` is bound to our closure environment.
+        drop(&a);
+        unsafe {
+            assert!(!HIT);
+        }
+    });
+    drop_during_call_save(&x);
+    *rc.borrow_mut() = Some(x);
+    drop(rc);
+    unsafe {
+        assert!(!HIT);
+    }
+    drop_during_call_call();
+    unsafe {
+        assert!(HIT);
+    }
+}
+
+#[wasm_bindgen_test]
+fn test_closure_returner() {
+    type ClosureType = dyn FnMut() -> BadStruct;
+
+    use js_sys::{Object, Reflect};
+    use wasm_bindgen::JsCast;
+
+    js_test_closure_returner();
+
+    #[wasm_bindgen]
+    pub struct ClosureHandle(Closure<ClosureType>);
+
+    #[wasm_bindgen]
+    pub struct BadStruct {}
+
+    #[wasm_bindgen]
+    pub fn closure_returner() -> Result<Object, JsValue> {
+        let o = Object::new();
+
+        let some_fn = Closure::wrap(Box::new(move || BadStruct {}) as Box<ClosureType>);
+        Reflect::set(
+            &o,
+            &JsValue::from("someKey"),
+            &some_fn.as_ref().unchecked_ref(),
+        )
+        .unwrap();
+        Reflect::set(
+            &o,
+            &JsValue::from("handle"),
+            &JsValue::from(ClosureHandle(some_fn)),
+        )
+        .unwrap();
+
+        Ok(o)
+    }
+}
+
+#[wasm_bindgen]
+pub struct RefFirstArgument {
+    contents: u32,
+}
+
+#[wasm_bindgen_test]
+fn reference_as_first_argument_builds_at_all() {
+    #[wasm_bindgen]
+    extern "C" {
+        fn ref_first_arg1(a: &dyn Fn(&JsValue));
+        fn ref_first_arg2(a: &mut dyn FnMut(&JsValue));
+        fn ref_first_arg3(a: &Closure<dyn Fn(&JsValue)>);
+        fn ref_first_arg4(a: &Closure<dyn FnMut(&JsValue)>);
+        fn ref_first_custom1(a: &dyn Fn(&RefFirstArgument));
+        fn ref_first_custom2(a: &mut dyn FnMut(&RefFirstArgument));
+        fn ref_first_custom3(a: &Closure<dyn Fn(&RefFirstArgument)>);
+        fn ref_first_custom4(a: &Closure<dyn FnMut(&RefFirstArgument)>);
+    }
+
+    Closure::wrap(Box::new(|_: &JsValue| ()) as Box<dyn Fn(&JsValue)>);
+    Closure::wrap(Box::new(|_: &JsValue| ()) as Box<dyn FnMut(&JsValue)>);
+    Closure::once(|_: &JsValue| ());
+    Closure::once_into_js(|_: &JsValue| ());
+    Closure::wrap(Box::new(|_: &RefFirstArgument| ()) as Box<dyn Fn(&RefFirstArgument)>);
+    Closure::wrap(Box::new(|_: &RefFirstArgument| ()) as Box<dyn FnMut(&RefFirstArgument)>);
+    Closure::once(|_: &RefFirstArgument| ());
+    Closure::once_into_js(|_: &RefFirstArgument| ());
+}
+
+#[wasm_bindgen_test]
+fn reference_as_first_argument_works() {
+    let a = Rc::new(Cell::new(0));
+    let b = {
+        let a = a.clone();
+        Closure::once(move |x: &RefFirstArgument| {
+            assert_eq!(a.get(), 0);
+            assert_eq!(x.contents, 3);
+            a.set(a.get() + 1);
+        })
+    };
+    let c = {
+        let a = a.clone();
+        Closure::once(move |x: &RefFirstArgument| {
+            assert_eq!(a.get(), 1);
+            assert_eq!(x.contents, 3);
+            a.set(a.get() + 1);
+        })
+    };
+    pass_reference_first_arg_twice(RefFirstArgument { contents: 3 }, &b, &c);
+    assert_eq!(a.get(), 2);
+}
+
+#[wasm_bindgen_test]
+fn reference_as_first_argument_works2() {
+    let a = Cell::new(0);
+    pass_reference_first_arg_twice2(
+        RefFirstArgument { contents: 3 },
+        &mut |x: &RefFirstArgument| {
+            assert_eq!(a.get(), 0);
+            assert_eq!(x.contents, 3);
+            a.set(a.get() + 1);
+        },
+        &mut |x: &RefFirstArgument| {
+            assert_eq!(a.get(), 1);
+            assert_eq!(x.contents, 3);
+            a.set(a.get() + 1);
+        },
+    );
+    assert_eq!(a.get(), 2);
+}
+
+#[wasm_bindgen_test]
+fn call_destroyed_doesnt_segfault() {
+    struct A(i32, i32);
+    impl Drop for A {
+        fn drop(&mut self) {
+            assert_eq!(self.0, self.1);
+        }
+    }
+
+    let a = A(1, 1);
+    let a = Closure::wrap(Box::new(move || drop(&a)) as Box<dyn Fn()>);
+    let b = a.as_ref().clone();
+    drop(a);
+    call_destroyed(&b);
+
+    let a = A(2, 2);
+    let a = Closure::wrap(Box::new(move || drop(&a)) as Box<dyn FnMut()>);
+    let b = a.as_ref().clone();
+    drop(a);
+    call_destroyed(&b);
+
+    let a = A(1, 1);
+    let a = Closure::wrap(Box::new(move |_: &JsValue| drop(&a)) as Box<dyn Fn(&JsValue)>);
+    let b = a.as_ref().clone();
+    drop(a);
+    call_destroyed(&b);
+
+    let a = A(2, 2);
+    let a = Closure::wrap(Box::new(move |_: &JsValue| drop(&a)) as Box<dyn FnMut(&JsValue)>);
+    let b = a.as_ref().clone();
+    drop(a);
+    call_destroyed(&b);
+}
+
+#[wasm_bindgen_test]
+fn forget_works() {
+    let a = Closure::wrap(Box::new(|| {}) as Box<dyn Fn()>);
+    js_store_forgotten_closure(&a);
+    a.forget();
+    js_call_forgotten_closure();
+}
+
+#[wasm_bindgen_test]
+fn named_externref_no_duplicate_adapter() {
+    externref_call(&Closure::new(|a| assert_eq!(a, 1)));
+    named_externref_call(&Closure::new(|a| assert_eq!(a, 1)));
+}