Add support Symbol.hasInstance as sample of static prop getter

src/js.rs

@@ -1388,3 +1388,17 @@ if_std! {
         }
     }
 }
+
+// Symbol
+#[wasm_bindgen]
+extern "C" {
+    pub type Symbol;
+
+    /// The Symbol.hasInstance well-known symbol is used to determine
+    /// if a constructor object recognizes an object as its instance.
+    /// The instanceof operator's behavior can be customized by this symbol.
+    ///
+    /// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/hasInstance
+    #[wasm_bindgen(static_method_of = Symbol, getter, structural, js_name = hasInstance)]
+    pub fn has_instance() -> Symbol;
+}

tests/all/js_globals/Symbol.rs

@@ -0,0 +1,37 @@
+#![allow(non_snake_case)]
+
+use project;
+
+#[test]
+fn has_instance() {
+    project()
+        .file(
+            "src/lib.rs",
+            r#"
+            #![feature(proc_macro, wasm_custom_section)]
+
+            extern crate wasm_bindgen;
+            use wasm_bindgen::prelude::*;
+            use wasm_bindgen::js;
+
+            #[wasm_bindgen]
+            pub fn symbol_has_instance() -> js::Symbol {
+                js::Symbol::has_instance()
+            }
+
+        "#,
+        )
+        .file(
+            "test.ts",
+            r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                assert.ok(wasm.symbol_has_instance());
+                assert.ok([] instanceof Array);
+            }
+        "#,
+        )
+        .test()
+}

tests/all/js_globals/mod.rs

@@ -19,6 +19,7 @@ mod Object;
 mod Proxy;
 mod Set;
 mod SetIterator;
+mod Symbol;
 mod TypedArray;
 mod WeakMap;
 mod WeakSet;