217308 2020-10-04 23:28:38 -0700 A question about constructor 2021-02-01 02:26:20 -0800 1 1 1 Unclassified WebKit JavaScriptCore WebKit Local Build PC Linux RESOLVED DUPLICATE 220429 InRadar P2 Normal --- 1 nisl_grammarly1 webkit-unassigned ashvayka webkit-bug-importer ysuzuki oldest_to_newest 1694640 0 nisl_grammarly1 2020-10-04 23:28:38 -0700 #Version： d940b47 #Testcase: var f = function (){ var x = 42; new x(x = function (){}); }; f(); #Command: ./webkit/WebKitBuild/Release/bin/jsc testcase.js #Output: #Expected output: TypeError: x is not a constructor #Description: When executing the above testcase, other engines threw a TypeError exception, such as v8, spiderMonkey, etc. But JavaScriptCore passed normally without throwing any exceptions. 1694957 1 webkit-bug-importer 2020-10-05 17:01:38 -0700 <rdar://problem/69977289> 1724154 2 ysuzuki 2021-02-01 02:26:07 -0800 *** This bug has been marked as a duplicate of bug 220429 *** 1724156 3 ysuzuki 2021-02-01 02:26:20 -0800 Thanks, this is fixed in bug 220429!