RESOLVED INVALID 205577
Wrong realization of eval() 
https://bugs.webkit.org/show_bug.cgi?id=205577
Summary Wrong realization of eval()
sunlili
Reported 2019-12-24 00:18:45 PST
What steps will reproduce the problem? 1.Running following code: let temp = eval('42;switch (0) { case 0: break; };'); console.log(temp); What is the expected output? 42 What do you see instead? undefined According to ecma manual,https://tc39.es/ecma262/#sec-block-runtime-semantics-evaluation, the value of a StatementList is the value of the last value producing item in the StatementList. However, switch statement not produce value, so the result should be 42. ISec Lab 2019.12.24
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Radar WebKit Bug Importer
Comment 1 2019-12-25 10:39:06 PST
<rdar://problem/58194612>
Keith Miller
Comment 2 2019-12-25 11:01:05 PST
I believe this behaves correctly, https://tc39.es/ecma262/#sec-runtime-semantics-caseblockevaluation, produces a normal completion of undefined if the StatementList if the case label has no production.
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