async-iteration: yield Promise.reject(value) -> next() results in a rejected promise for value. Ref gh-1052

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

- http://tc39.github.io/tc39-notes/2017-05_may-25.html#15iva-revisiting-async-generator-yield-behavior
- http://tc39.github.io/tc39-notes/2017-05_may-25.html#conclusionresolution-12



Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Add missing harness tests

- correction to license
- use Number.isNaN

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Previously, test consumers were encouraged to insert a `throw` statement
as the first statement of tests for early errors. This recommendation
made tests harder to consume, and as an optional transformation,
consumers may have ignored it or simply been unaware it was made. By
explicitly including such a `throw` statement, the tests become more
literal, making them easier to consume and more transparent in their
expectations.

Document expectation for all tests for early errors to include an
explicit `throw` statement. Extend linting script to verify that
contributors are automatically notified of violations and to ensure that
future contributions satisfy this expectation.

This pattern makes expectations more explicit by making test files more
literal.

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Remove tests that allow `...{` in object destructuring. Ref gh-1050

toExponential had a typo, and toFixed was against an earlier version
of the specification proposal. The tests pass against a version of V8
which attempts to implement the new spec.

Improve named groups coverage

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>