Commits on Apr 2, 2020

1. Normative: Fully specify legal escape sequences in RegExp capture gro… …

   …up names (#1869)
   
   This commit makes the Early Errors for RegExpIdentifierStart and RegExpIdentifierPart fully specified, with the semantics that Unicode escape sequences of the form `\u LeadSurrogate \u TrailSurrogate` as well as `\u { CodePoint }` are legal in named capture group names for both Unicode and non-Unicode regular expressions.
   
   Fixes #1861

   

   bakkot authored and ljharb committed Apr 2, 2020
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