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Nate Cook
043bca1136
This removes the `async` overloads to `parse` and `parseAsRoot` that caused a source break in 1.8.0, and introduces new names that disambiguate the methods with `async` behavior. Instead of calling the existing methods with the `await` keyword, users can call `await asyncParse` or `await asyncParseAsRoot`. This change also adds a validation step to the synchronous parsing path to check if an async completions function is called. Users that have already updated their code to work around the source break will revert to the old methods with this change, which will yield a "No 'async' operations occur within 'await' expression" warning. They can remove the `await` keyword or update to call the async versions directly to fix the warning.