220142 2020-12-24 05:20:53 -0800 A possible issue about variable redeclaration 2020-12-31 12:28:26 -0800 1 1 1 Unclassified WebKit JavaScriptCore WebKit Local Build PC Linux RESOLVED DUPLICATE 163209 InRadar P2 Normal --- 1 nwu_ty webkit-unassigned ashvayka fpizlo webkit-bug-importer ysuzuki oldest_to_newest 1716570 0 nwu_ty 2020-12-24 05:20:53 -0800 # Version d940b47(https://github.com/WebKit/WebKit-http/commit/d940b477848884f63752d25491d9dd0b9d3ccb2d) # Testcase1: // Will throw an SyntaxError function func() { if (1) { function o() {} var o = 1; } } # Testcase2: // Will not throw an SyntaxError if (1) { function o() {}; var o = 1; } # Description In both of the above examples, an variable 'o' declaration error occurred, however Testcase1 throws an exception and Testcase2 doesn't. I've tried other engines(such as V8, SpiderMonkey), and they all throw SyntaxError, So i suspect it's a bug of jsc. Please let me know the result whether this is a bug or not. Looking forward to your reply, thanks! 😆 1716908 1 webkit-bug-importer 2020-12-31 05:21:13 -0800 <rdar://problem/72754003> 1716926 2 ysuzuki 2020-12-31 12:28:26 -0800 Thanks, this is dupe of 163209 :) *** This bug has been marked as a duplicate of bug 163209 ***