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ES2016 Draft 2015-11-03

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@bterlson bterlson released this 03 Nov 23:56
es2016-draft-20151103
651f632

This release includes a very large number of editorial changes and markup fixes. The most notable include:

  • A new convention for calling ReturnIfAbrupt. Namely, the ? operator can precede a call to an abstract operation and indicates that ReturnIfAbrupt should be applied to the result.
  • Substantial normalization of the usage of ReturnIfAbrupt - many missing calls were added, and many superfluous ones were removed.
  • Many ECMASpeak syntax errors have been fixed.

This release also includes the following normative changes:

  • Add missing ToUint32 coercions to ArrayAccumulation nextIndex and Array Evaluation pad and len.
  • Add invariants for [[IsExtensible]], notably that it must return a Boolean and once it returns false it must always return false.
  • Add %TypedArray%.prototype.toLocaleString to the list of forbidden extensions in clause 16.1 as this is defined in ECMA-402.
  • proto is now allowed as an extension in strict mode code. This aligns the spec with implementation reality.
  • Add missing HasDirectSuper static semantics restrictions to GeneratorDeclaration.
  • RegExp.prototype[@@ split] will no longer attempt to access string elements beyond the string length.
  • Annex B.3.3 semantics now apply to non-top-level functions as well as top-level functions.
  • Date.parse now explicitly specifies that date-only forms without a UTC offset are interpreted as UTC. While not ideal semantics, it is nonetheless required for web compatibility (#138).
  • When removing the sloppy-mode arguments object mapping (due to, say, defining a property on the arguments object), the current value of the binding is assigned to the arguments object before the mapping is removed. This aligns the spec with implementation reality.
  • TypedArray's [[ByteOffset]] can no longer be -0. -0 is coerced to +0.
  • DataView's SetViewValue now coerces value to a number.
  • The length of the proxy revocation function is now 0 (previously unspecified).
  • Add missing PrepareForTailCall to Function.prototype.apply.
  • EvalDeclarationInstantiation now throws TypeErrors where ES5 threw TypeErrors. This also aligns the spec with implementation reality.
  • ModuleDeclarationInstantiation will now only initialize a var binding once even when multiple var bindings of the same name exist.
  • Fix missing completion reform for if and with. Specifically, if the result of evaluating these productions is an abrupt break completion, the completion type is changed to normal with a value of undefined.

Bugzilla bugs fixed: 4538 4489 4477 4469 4505 4504 4495 4494 4420 4471 4455 4434 4433 4427 4419 4371 4544 4536 4523 4521 4520 4519 4511 4506 4502 4501 4490 4488 4486 4485 4483 4480 4472 4462 4540 4541 4442 4466 4468 4478 4499 4509 4512 4513 4518 4543 4445 4460 4461 4475 4441 4444 4446 4447 4449 4450 4451 4452 4453 4454 4458 4459 4463 4464 4470 4473 4476 4479 4481 4491 4493 4517 4524 4527

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