[Webkit-unassigned] [Bug 207091] New: Non-alphabetical \c escapes should be syntax errors in Unicode patterns only

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=207091

            Bug ID: 207091
           Summary: Non-alphabetical \c escapes should be syntax errors in
                    Unicode patterns only
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Trivial
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: shvaikalesh at gmail.com

Test case:
  /\c2/u

Expected:
  SyntaxError thrown

Actual:
  RegExp instance

ECMA262:
  https://tc39.es/ecma262/#prod-annexB-ClassEscape (/u flag precludes the use of ClassControlLetter)

  ClassEscape[U, N] ::
    [~U] c ClassControlLetter

  ClassControlLetter ::
    DecimalDigit
    _

Test262:
  https://test262.report/browse/built-ins/RegExp/unicode_restricted_identity_escape_c.js
  https://test262.report/browse/language/literals/regexp/u-invalid-class-escape.js

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