162013 2016-09-15 02:08:56 -0700 test262: Should be a SyntaxError for duplicate parameter names in function with default parameters 2016-09-15 08:43:06 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 joepeck joepeck commit-queue keith_miller mark.lam msaboff saam oldest_to_newest 1229955 0 joepeck 2016-09-15 02:08:56 -0700 Summary: Should be a SyntaxError for duplicate parameter names in function with default parameters Currently we only issue a SyntaxError if their is a duplicate name and it or later there is default parameter value: jsc> function f(x, x = 0) {} Duplicate parameter 'x' not allowed in function with default parameter values.:1 We should, but aren't, issuing the same SyntaxError if there is a duplicate name and there was an earlier default parameter values. jsc> function f(x = 0, x) {} undefined We should be issuing a SyntaxError if there is a duplicate name if there are any default parameters. Spec: https://tc39.github.io/ecma262/#sec-function-definitions-static-semantics-early-errors > FormalParameters : FormalParameterList > > It is a Syntax Error if IsSimpleParameterList of FormalParameterList is > false and BoundNames of FormalParameterList contains any duplicate elements. https://tc39.github.io/ecma262/#sec-destructuring-binding-patterns-static-semantics-issimpleparameterlist IsSimpleParameterList is false if the parameter list contains things like any RestParameters, BindingPatterns (destructuring), or BindingIdentifiers with Initialization (default parameters). Notes: - Covered in a bunch of test262 tests, like: test262/test/language/expressions/function/params-dflt-duplicates.js 1229956 1 288944 joepeck 2016-09-15 02:15:28 -0700 Created attachment 288944 [PATCH] Proposed Fix 1230009 2 288944 commit-queue 2016-09-15 08:43:03 -0700 Comment on attachment 288944 [PATCH] Proposed Fix Clearing flags on attachment: 288944 Committed r205969: <http://trac.webkit.org/changeset/205969> 1230010 3 commit-queue 2016-09-15 08:43:06 -0700 All reviewed patches have been landed. Closing bug. 288944 2016-09-15 02:15:28 -0700 2016-09-15 08:43:03 -0700 [PATCH] Proposed Fix default-param-1.patch text/plain 8904 joepeck ZGlmZiAtLWdpdCBhL0pTVGVzdHMvQ2hhbmdlTG9nIGIvSlNUZXN0cy9DaGFuZ2VMb2cKaW5kZXgg ZjQzOGUwMi4uMTU0OWZhNyAxMDA2NDQKLS0tIGEvSlNUZXN0cy9DaGFuZ2VMb2cKKysrIGIvSlNU ZXN0cy9DaGFuZ2VMb2cKQEAgLTEsMyArMSwxMyBAQAorMjAxNi0wOS0xNSAgSm9zZXBoIFBlY29y YXJvICA8cGVjb3Jhcm9AYXBwbGUuY29tPgorCisgICAgICAgIHRlc3QyNjI6IFNob3VsZCBiZSBh IFN5bnRheEVycm9yIGZvciBkdXBsaWNhdGUgcGFyYW1ldGVyIG5hbWVzIGluIGZ1bmN0aW9uIHdp dGggZGVmYXVsdCBwYXJhbWV0ZXJzCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3No b3dfYnVnLmNnaT9pZD0xNjIwMTMKKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMh KS4KKworICAgICAgICAqIHN0cmVzcy9lczYtZGVmYXVsdC1wYXJhbWV0ZXJzLmpzOgorICAgICAg ICAqIHRlc3QyNjIueWFtbDoKKwogMjAxNi0wOS0xNCAgSm9zZXBoIFBlY29yYXJvICA8cGVjb3Jh cm9AYXBwbGUuY29tPgogCiAgICAgICAgIEFTU0VSVF9OT1RfUkVBQ0hFRCB3aGVuIHVzaW5nIHNw cmVhZCBpbnNpZGUgYW4gYXJyYXkgbGl0ZXJhbCB3aXRoIEZ1bmN0aW9uLnByb3RvdHlwZS5hcHBs 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