facebook / facebook/flow

ES2018: tagged template literals should allow invalid escape sequences

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parsing test262
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Description

https://github.com/tc39/proposal-template-literal-revision is stage 4. **tagged** template literals should be allowed to have invalid escape sequences like

```
latex`\unicode{blah}`
```

see https://github.com/tc39/test262/blob/master/test/language/expressions/tagged-template/invalid-escape-sequences.js for some more examples.

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