[Webkit-unassigned] [Bug 207114] New: \0 identity escapes should be syntax errors in Unicode patterns only

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=207114

            Bug ID: 207114
           Summary: \0 identity 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:
  new RegExp("\\\0", "u")

Expected:
  SyntaxError thrown

Actual:
  RegExp instance

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

  IdentityEscape[U, N] ::
    [~U] SourceCharacterIdentityEscape[?N]

  SourceCharacterIdentityEscape[N] ::
    [~N] SourceCharacter but not c

  SourceCharacter ::
    any Unicode code point

Test262:
  https://test262.report/browse/built-ins/RegExp/unicode_restricted_identity_escape.js

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