LibJS: Set name of anonymous functions during assignment

Author: https://github.com/linusg
Commit: 25cf0da2fb
Pull-request: https://github.com/SerenityOS/serenity/pull/2070

Libraries/LibJS/Tests/function-name.js

@@ -1,16 +1,44 @@
 load("test-common.js");
 
 try {
-    var f = function () { }
-    assert(f.name === "");
-    assert((f.name = "f") === "f");
-    assert(f.name === "");
+    assert((function () { }).name === "");
 
-    function foo() { }
+    var foo = function () { }
     assert(foo.name === "foo");
     assert((foo.name = "bar") === "bar");
     assert(foo.name === "foo");
 
+    var a, b;
+    a = b = function () { }
+    assert(a.name === "b");
+    assert(b.name === "b");
+
+    var arr = [
+        function () { },
+        function () { },
+        function () { }
+    ];
+    assert(arr[0].name === "arr");
+    assert(arr[1].name === "arr");
+    assert(arr[2].name === "arr");
+
+    var f;
+    var o = { a: function () { } };
+    assert(o.a.name === "a");
+    f = o.a;
+    assert(f.name === "a");
+    assert(o.a.name === "a");
+    o = { ...o, b: f };
+    assert(o.a.name === "a");
+    assert(o.b.name === "a");
+    o.c = function () { };
+    assert(o.c.name === "c");
+
+    function bar() { }
+    assert(bar.name === "bar");
+    assert((bar.name = "baz") === "baz");
+    assert(bar.name === "bar");
+
     assert(console.log.name === "log");
     assert((console.log.name = "warn") === "warn");
     assert(console.log.name === "log");