189914 2018-09-24 06:46:27 -0700 Throws incorrectly a syntax error when declaring a top level catch variable the same as a parameter 2020-03-11 13:50:01 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 seba.kerckhof keith_miller commit-queue ews-watchlist fpizlo keith_miller ljharb mark.lam m.goleb+bugzilla msaboff ross.kirsling saam seba.kerckhof simon.fraser tzagallo webkit-bug-importer ysuzuki oldest_to_newest 1462688 0 seba.kerckhof 2018-09-24 06:46:27 -0700 I wouldn't write code like this (below) myself, but it was emitted by the minifier and so my app doesn't work in Safari, or Safari TP (build 65 / 10 september 2018). The code looks legal to me ... class Foo{ foo(o){ try{ }catch({ o }){ } } } results in "SyntaxError: unexpected token: '}'. Cannot declare a lexical variable twice: 'o'." And the variation: class Foo{ foo(o){ try{ }catch({ prop: o }){ } } } results in "SyntaxError: unexpected identifier 'o'. Cannot declare a lexical variable twice: 'o'." 1463122 1 seba.kerckhof 2018-09-25 03:29:24 -0700 Other variations with same problem: Normal function: function foo(c){try{}catch({c}){}} Arrow function: const foo=c=>{try{}catch({c}){}}; Object shorthand literal: const foo = { bar(c){try{}catch({c}){}} } Note that it only seems related to destructuring catch clause arguments, e.g. this works: function foo(c){try{}catch(c){}} 1628542 2 webkit-bug-importer 2020-03-10 23:01:25 -0700 <rdar://problem/60309235> 1628673 3 393248 simon.fraser 2020-03-11 09:17:40 -0700 Created attachment 393248 Test case 1628709 4 keith_miller 2020-03-11 10:10:52 -0700 Ah, thanks for the report. I think this is happening because we were not incrementing the statement depth (we use the numeric depth as an optimization for determining if we should do the hash table lookup for parameter shadowing) when parsing catch parameters. Should be an easy fix. 1628710 5 keith_miller 2020-03-11 10:12:07 -0700 For what it's worth, sorry about the the delay on this. I think this got lost in our bug tracking system... :( 1628718 6 ross.kirsling 2020-03-11 10:27:17 -0700 Test262 evidently does not have a spec conformance test for this behavior. Note that the shorthand destructuring syntax also makes the problem a bit less clear (since Error objects are only guaranteed to have a `message` field). It's specifically this that fails: > function foo(m) { try {} catch ({ message: m }) {} } 1628721 7 keith_miller 2020-03-11 10:30:39 -0700 (In reply to Ross Kirsling from comment #6) > Test262 evidently does not have a spec conformance test for this behavior. There's nothing inside a function but test/language/statements/try/scope-catch-param-lex-open.js has array destructing at the top level with a lexical variable of the same name. > > Note that the shorthand destructuring syntax also makes the problem a bit > less clear (since Error objects are only guaranteed to have a `message` > field). Well you don't have the throw an Error object you can throw anything you want! :P > > It's specifically this that fails: > > function foo(m) { try {} catch ({ message: m }) {} } 1628743 8 ross.kirsling 2020-03-11 10:49:58 -0700 (In reply to Keith Miller from comment #7) > There's nothing inside a function but > test/language/statements/try/scope-catch-param-lex-open.js has array > destructing at the top level with a lexical variable of the same name. That's a good find! I'm surprised that `var x; try {} catch ([x]) {}` fails, because it doesn't fail with let/const. > Well you don't have the throw an Error object you can throw anything you > want! :P Oh geez, apparently I've not had enough coffee this morning. 😅 1628756 9 393267 keith_miller 2020-03-11 11:03:18 -0700 Created attachment 393267 Patch 1628761 10 393267 saam 2020-03-11 11:12:08 -0700 Comment on attachment 393267 Patch r=me 1628762 11 393267 ross.kirsling 2020-03-11 11:13:02 -0700 Comment on attachment 393267 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=393267&action=review r=me if EWS is green and Test262 is locally happy > JSTests/ChangeLog:8 > + * stress/catch-destructing-shadow-lexical-const-variable-global.js: Added. nit: destructing -> destructuring > JSTests/stress/catch-destructing-shadow-lexical-variable-global.js:2 > +let o = value; Maybe combine this file with the const one and add a var case too? 1628764 12 393267 keith_miller 2020-03-11 11:15:22 -0700 Comment on attachment 393267 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=393267&action=review >> JSTests/stress/catch-destructing-shadow-lexical-variable-global.js:2 >> +let o = value; > > Maybe combine this file with the const one and add a var case too? I didn't combine them because it would be an error to declare a const and let with the same name. I guess I could choose a new variable name but that's too clever for me. :P 1628765 13 ross.kirsling 2020-03-11 11:17:19 -0700 (In reply to Keith Miller from comment #12) > I didn't combine them because it would be an error to declare a const and > let with the same name. I guess I could choose a new variable name but > that's too clever for me. :P I mean, you could use blocks. :P But either way. 1628769 14 keith_miller 2020-03-11 11:28:55 -0700 (In reply to Ross Kirsling from comment #13) > (In reply to Keith Miller from comment #12) > > I didn't combine them because it would be an error to declare a const and > > let with the same name. I guess I could choose a new variable name but > > that's too clever for me. :P > > I mean, you could use blocks. :P But either way. That wouldn't be m_statementDepth == 1 though. So it wouldn't really be testing the issue. 1628793 15 393276 keith_miller 2020-03-11 12:39:45 -0700 Created attachment 393276 Patch for landing 1628827 16 393276 commit-queue 2020-03-11 13:26:12 -0700 Comment on attachment 393276 Patch for landing Clearing flags on attachment: 393276 Committed r258279: <https://trac.webkit.org/changeset/258279> 1628828 17 commit-queue 2020-03-11 13:26:14 -0700 All reviewed patches have been landed. Closing bug. 393248 2020-03-11 09:17:40 -0700 2020-03-11 09:17:40 -0700 Test case test.html text/html 109 simon.fraser PHNjcmlwdD4KICAgIGNsYXNzIEZvb3sKICAgICAgZm9vKG8pewogICAgICAgIHRyeXsKCiAgICAg ICAgfWNhdGNoKHsgbyB9KXsKCiAgICAgICAgfQogICAgICB9CiAgICB9Cjwvc2NyaXB0Pg== 393267 2020-03-11 11:03:18 -0700 2020-03-11 12:39:43 -0700 Patch bug-189914-20200311110317.patch text/plain 8809 keith_miller U3VidmVyc2lvbiBSZXZpc2lvbjogMjU4MjYzCmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCAy YjViMzQ2Yzc2MzhkYjdmMTQ2ODhlYjllNjMwODZhZDQ5OTkzMWNhLi5jYmI1NzA3ZDc5ODFlYzZl Nzg4NDNiOTFjM2I2MDcxN2YwYjJjNmQxIDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv cmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKQEAgLTEs MyArMSwxNiBAQAorMjAyMC0wMy0xMSAgS2VpdGggTWlsbGVyICA8a2VpdGhfbWlsbGVyQGFwcGxl LmNvbT4KKworICAgICAgICBUaHJvd3MgaW5jb3JyZWN0bHkgYSBzeW50YXggZXJyb3Igd2hlbiBk 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