text: // Copyright 2017 the V8 project authors. All rights reserved.
  // This code is governed by the BSD license found in the LICENSE file.
  
  /*---
  description: Various syntax errors for Unicode RegExps containing named groups
  esid: prod-GroupSpecifier
  features: [regexp-named-groups]
  ---*/
  
  assert.throws(SyntaxError, () => eval("/(?<>a)/u"), "Empty name");
  assert.throws(SyntaxError, () => eval("/(?<aa)/u"), "Unterminated name");
  assert.throws(SyntaxError, () => eval("/(?<42a>a)/u"), "Name starting with digits");
  assert.throws(SyntaxError, () => eval("/(?<:a>a)/u"), "Name starting with invalid char");
  assert.throws(SyntaxError, () => eval("/(?<a:>a)/u"), "Name containing with invalid char");
  assert.throws(SyntaxError, () => eval("/(?<a>a)(?<a>a)/u"), "Duplicate name");
  assert.throws(SyntaxError, () => eval("/(?<a>a)(?<b>b)(?<a>a)/u"), "Duplicate name");
  assert.throws(SyntaxError, () => eval("/\\k<a>/u"), "Invalid reference");
  assert.throws(SyntaxError, () => eval("/\\k<a/u"), "Unterminated reference");
  assert.throws(SyntaxError, () => eval("/\\k<>/u"), "Empty reference");
  assert.throws(SyntaxError, () => eval("/\\k/u"), "Lone \k");
  assert.throws(SyntaxError, () => eval("/(?<a>.)\\k/u"), "Lone \k");
  assert.throws(SyntaxError, () => eval("/(?<a>.)\\k<a/u"), "Unterminated reference");
  assert.throws(SyntaxError, () => eval("/(?<a>.)\\k<>/u"), "Empty reference");
  assert.throws(SyntaxError, () => eval("/(?<a>.)\\k<b>/u"), "Invalid reference");
  assert.throws(SyntaxError, () => eval("/(?<a>a)\\k<ab>/u"), "Invalid reference");
  assert.throws(SyntaxError, () => eval("/(?<ab>a)\\k<a>/u"), "Invalid reference");
  assert.throws(SyntaxError, () => eval("/\\k<a>(?<ab>a)/u"), "Invalid reference");
  assert.throws(SyntaxError, () => eval("/(?<a>\\a)/u"), "Identity escape in capture");
  
  