33849 2010-01-19 10:58:09 -0800 const decl shadowing 2012-03-07 00:33:04 -0800 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) All All RESOLVED DUPLICATE 31813 P2 Normal --- 1 antonm webkit-unassigned ager barraclough dglazkov ggaren oliver oldest_to_newest 182322 0 46928 antonm 2010-01-19 10:58:09 -0800 Created attachment 46928 Small test to see how var and const declared properties are shadowed in various browsers http://trac.webkit.org/changeset/47062 added a layout test to check that shadowing of const declared properties on global object is impossible. However most of other browsers behave differently---attached HTML shows that FF, Opera and Safari allow to shadow both var and const declared properties (IE8 didn't output anything)---and only Safari forbids shadowing of const properties. Semantics of shadowing/constness is not quite obvious, so it might be easily not a bug though. 182324 1 antonm 2010-01-19 10:59:21 -0800 (In reply to comment #0) > Created an attachment (id=46928) [details] > Small test to see how var and const declared properties are shadowed in various > browsers > > http://trac.webkit.org/changeset/47062 added a layout test to check that > shadowing of const declared properties on global object is impossible. However > most of other browsers behave differently---attached HTML shows that FF, Opera > and Safari allow to shadow both var and const declared properties (IE8 didn't > output anything)---and only Safari forbids shadowing of const properties. > > Semantics of shadowing/constness is not quite obvious, so it might be easily > not a bug though. Correction: FF, Opera and <Chromium> allow to shadow both var and const declared properties. 572648 2 barraclough 2012-03-07 00:33:04 -0800 We should resolved this by implementing ES Harmony block scoped const. *** This bug has been marked as a duplicate of bug 31813 *** 46928 2010-01-19 10:58:09 -0800 2010-01-19 10:58:09 -0800 Small test to see how var and const declared properties are shadowed in various browsers test-const-var.html text/html 761 antonm PGh0bWw+CjxoZWFkPgo8L2hlYWQ+Cjxib2R5IG9ubG9hZD0icnVuKCkiPgogIDxvbCBpZD0naWQx Jz48L29sPgogIDxvbCBpZD0naWQyJz48L29sPgoKICA8aDE+Q2hlY2tpbmcgaG93IDx0dD5jb25z dDwvdHQ+IGFuZCA8dHQ+dmFyPC90dD4gc2hhZG93aW5nIHdvcmtzPC9oMT4KICA8ZGl2IGlkPSJv dXRwdXQiPjwvZGl2PgogIDxzY3JpcHQ+CiAgICBjb25zdCBpZDFfc2hhZG93ID0gImlkMSI7CiAg ICBjb25zdCBpZDJfc2hhZG93ID0gImlkMiI7CgogICAgdmFyIGlkMSA9IGlkMV9zaGFkb3c7CiAg ICBjb25zdCBpZDIgPSBpZDJfc2hhZG93OwoKICAgIGZ1bmN0aW9uIHN0YXR1cyhvYmosIHNoYWRv d2VkLCBvcmlnaW5hbCkgewogICAgICBpZiAob2JqID09PSBzaGFkb3dlZCkgcmV0dXJuICJzaGFk b3dlZCI7CiAgICAgIGlmIChvYmogPT09IG9yaWdpbmFsKSByZXR1cm4gIk5PVCBzaGFkb3dlZCI7 CiAgICAgIHJldHVybiAiV0VJUkQiOwogICAgfQoKICAgIGZ1bmN0aW9uIHJ1bigpIHsKICAgICAg b3V0cHV0LmlubmVySFRNTCArPSAnPHA+dmFyIGlkMSAnICAgKyBzdGF0dXMoaWQxLCBpZDFfc2hh ZG93LCBkb2N1bWVudC5nZXRFbGVtZW50QnlJZCgnaWQxJykpICsgJzwvcD4nOwogICAgICBvdXRw dXQuaW5uZXJIVE1MICs9ICc8cD5jb25zdCBpZDIgJyArIHN0YXR1cyhpZDIsIGlkMl9zaGFkb3cs IGRvY3VtZW50LmdldEVsZW1lbnRCeUlkKCdpZDInKSkgKyAnPC9wPic7CiAgICB9CiAgPC9zY3Jp cHQ+CjwvYm9keT4KPC9odG1sPgo=