Support extended unicode escapes in identifiers, per es6 spec #32725
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weswigham
commented
Aug 6, 2019
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Note that this just peeks to make sure the escape scans and doesn't validate that the resulting number is in the expected range - scanExtendedUnicodeEscape (which is called after both uses to get the real value) does all that.
rbuckton
approved these changes
Aug 6, 2019
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Fixes #5291
Just to fill out the list of unicode-related things we could pretty easily fix