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Ran 04 Nov 2019 12:31PM UTC

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Committed 04 Nov 2019 12:26PM UTC coverage: 70.941%. First build

Job # 993.1

Build Type

push

travis-ci-com

Committed by

odino

Commit Message

Optional chaining, closes #296

This PR adds optional chaining to the language, allowing to
access "deep" properties and methods without having to validate
the whole object hierarchy:

```
a.b.c.d.e()
```

would return an error if any step of the way is `null`.

This can be rewritten as:

```
a?.b?.c?.d?.e()
```

and would return `null`, without breaking a script.

Largely inspired by [this](https://chromestatus.com/feature/5668249494618112).

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2866 of 4040 relevant lines covered (70.94%)

40.72 hits per line

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master: 63%

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master: 63%

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