Check that all errors are instances of Object

Part of wasm-bindgen#670

Author: kraai

crates/js-sys/tests/wasm/RangeError.rs

@@ -8,6 +8,7 @@ fn range_error() {
     let error = RangeError::new("out of range yo");
     assert!(error.is_instance_of::<RangeError>());
     assert!(error.is_instance_of::<Error>());
+    assert!(error.is_instance_of::<Object>());
 
     let base: &Error = error.as_ref();
     assert_eq!(JsValue::from(base.message()), "out of range yo");

crates/js-sys/tests/wasm/ReferenceError.rs

@@ -8,6 +8,7 @@ fn reference_error() {
     let error = ReferenceError::new("bad reference, fool");
     assert!(error.is_instance_of::<ReferenceError>());
     assert!(error.is_instance_of::<Error>());
+    assert!(error.is_instance_of::<Object>());
 
     let base: &Error = error.as_ref();
     assert_eq!(JsValue::from(base.message()), "bad reference, fool");

crates/js-sys/tests/wasm/SyntaxError.rs

@@ -8,6 +8,7 @@ fn syntax_error() {
     let error = SyntaxError::new("msg");
     assert!(error.is_instance_of::<SyntaxError>());
     assert!(error.is_instance_of::<Error>());
+    assert!(error.is_instance_of::<Object>());
 
     let base: &Error = error.as_ref();
     assert_eq!(JsValue::from(base.message()), "msg");

crates/js-sys/tests/wasm/TypeError.rs

@@ -8,6 +8,7 @@ fn type_error() {
     let error = TypeError::new("msg");
     assert!(error.is_instance_of::<TypeError>());
     assert!(error.is_instance_of::<Error>());
+    assert!(error.is_instance_of::<Object>());
 
     let base: &Error = error.as_ref();
     assert_eq!(JsValue::from(base.message()), "msg");

crates/js-sys/tests/wasm/UriError.rs

@@ -8,6 +8,7 @@ fn uri_error() {
     let error = UriError::new("msg");
     assert!(error.is_instance_of::<UriError>());
     assert!(error.is_instance_of::<Error>());
+    assert!(error.is_instance_of::<Object>());
 
     let base: &Error = error.as_ref();
     assert_eq!(JsValue::from(base.message()), "msg");