text: var BUGNUMBER = 1135377;
  var summary = "Implement RegExp unicode flag -- braced pattern in RegExpUnicodeEscapeSequence.";
  
  //print(BUGNUMBER + ": " + summary);
  
  // ==== standalone ====
  
  assertEqArray(/\u{41}/u.exec("ABC"),
                ["A"]);
  assertEqArray(/\u{41}/.exec("ABC" + "u".repeat(41)),
                ["u".repeat(41)]);
  
  assertEqArray(/\u{4A}/u.exec("JKL"),
                ["J"]);
  assertEqArray(/\u{4A}/.exec("JKLu{4A}"),
                ["u{4A}"]);
  
  assertEqArray(/\u{1F438}/u.exec("\u{1F438}"),
                ["\u{1F438}"]);
  assertEqArray(/\u{1F438}/.exec("u{1F438}"),
                ["u{1F438}"]);
  
  assertEqArray(/\u{0}/u.exec("\u{0}"),
                ["\u{0}"]);
  assertEqArray(/\u{10FFFF}/u.exec("\u{10FFFF}"),
                ["\u{10FFFF}"]);
  assertEqArray(/\u{10ffff}/u.exec("\u{10FFFF}"),
                ["\u{10FFFF}"]);
  
  // leading 0
  assertEqArray(/\u{0000000000000000000000}/u.exec("\u{0}"),
                ["\u{0}"]);
  assertEqArray(/\u{000000000000000010FFFF}/u.exec("\u{10FFFF}"),
                ["\u{10FFFF}"]);
  
  // RegExp constructor
  assertEqArray(new RegExp("\\u{0}", "u").exec("\u{0}"),
                ["\u{0}"]);
  assertEqArray(new RegExp("\\u{41}", "u").exec("ABC"),
                ["A"]);
  assertEqArray(new RegExp("\\u{1F438}", "u").exec("\u{1F438}"),
                ["\u{1F438}"]);
  assertEqArray(new RegExp("\\u{10FFFF}", "u").exec("\u{10FFFF}"),
                ["\u{10FFFF}"]);
  
  assertEqArray(new RegExp("\\u{0000000000000000}", "u").exec("\u{0}"),
                ["\u{0}"]);
  
  assertEqArray(eval(`/\\u{${"0".repeat(Math.pow(2, 24)) + "1234"}}/u`).exec("\u{1234}"),
                ["\u{1234}"]);
  assertEqArray(new RegExp(`\\u{${"0".repeat(Math.pow(2, 24)) + "1234"}}`, "u").exec("\u{1234}"),
                ["\u{1234}"]);
  
  // ==== ? ====
  
  assertEqArray(/\u{1F438}?/u.exec("\u{1F438}"),
                ["\u{1F438}"]);
  assertEqArray(/\u{1F438}?/u.exec(""),
                [""]);
  
  // lead-only target
  assertEqArray(/\u{1F438}?/u.exec("\uD83D"),
                [""]);
  
  // RegExp constructor
  assertEqArray(new RegExp("\\u{1F438}?", "u").exec("\u{1F438}"),
                ["\u{1F438}"]);
  assertEqArray(new RegExp("\\u{1F438}?", "u").exec(""),
                [""]);
  assertEqArray(new RegExp("\\u{1F438}?", "u").exec("\uD83D"),
                [""]);
  
  // ==== + ====
  
  assertEqArray(/\u{1F438}+/u.exec("\u{1F438}"),
                ["\u{1F438}"]);
  assertEqArray(/\u{1F438}+/u.exec("\u{1F438}\u{1F438}"),
                ["\u{1F438}\u{1F438}"]);
  assertEq(/\u{1F438}+/u.exec(""),
           null);
  
  // lead-only target
  assertEq(/\u{1F438}+/u.exec("\uD83D"),
           null);
  assertEqArray(/\u{1F438}+/u.exec("\uD83D\uDC38\uDC38"),
                ["\uD83D\uDC38"]);
  
  // ==== * ====
  
  assertEqArray(/\u{1F438}*/u.exec("\u{1F438}"),
                ["\u{1F438}"]);
  assertEqArray(/\u{1F438}*/u.exec("\u{1F438}\u{1F438}"),
                ["\u{1F438}\u{1F438}"]);
  assertEqArray(/\u{1F438}*/u.exec(""),
                [""]);
  
  // lead-only target
  assertEqArray(/\u{1F438}*/u.exec("\uD83D"),
                [""]);
  assertEqArray(/\u{1F438}*/u.exec("\uD83D\uDC38\uDC38"),
                ["\uD83D\uDC38"]);
  
  // ==== lead-only ====
  
  // match only non-surrogate pair
  assertEqArray(/\u{D83D}/u.exec("\uD83D\uDBFF"),
                ["\uD83D"]);
  assertEq(/\u{D83D}/u.exec("\uD83D\uDC00"),
           null);
  assertEq(/\u{D83D}/u.exec("\uD83D\uDFFF"),
           null);
  assertEqArray(/\u{D83D}/u.exec("\uD83D\uE000"),
                ["\uD83D"]);
  
  // match before non-tail char
  assertEqArray(/\u{D83D}/u.exec("\uD83D"),
                ["\uD83D"]);
  assertEqArray(/\u{D83D}/u.exec("\uD83DA"),
                ["\uD83D"]);
  
  // ==== trail-only ====
  
  // match only non-surrogate pair
  assertEqArray(/\u{DC38}/u.exec("\uD7FF\uDC38"),
                ["\uDC38"]);
  assertEq(/\u{DC38}/u.exec("\uD800\uDC38"),
           null);
  assertEq(/\u{DC38}/u.exec("\uDBFF\uDC38"),
           null);
  assertEqArray(/\u{DC38}/u.exec("\uDC00\uDC38"),
                ["\uDC38"]);
  
  // match after non-lead char
  assertEqArray(/\u{DC38}/u.exec("\uDC38"),
                ["\uDC38"]);
  assertEqArray(/\u{DC38}/u.exec("A\uDC38"),
                ["\uDC38"]);
  
  // ==== wrong patterns ====
  
  assertThrowsInstanceOf(() => eval(`/\\u{-1}/u`), SyntaxError);
  assertThrowsInstanceOf(() => eval(`/\\u{0.0}/u`), SyntaxError);
  assertThrowsInstanceOf(() => eval(`/\\u{G}/u`), SyntaxError);
  assertThrowsInstanceOf(() => eval(`/\\u{}/u`), SyntaxError);
  assertThrowsInstanceOf(() => eval(`/\\u{{/u`), SyntaxError);
  assertThrowsInstanceOf(() => eval(`/\\u{/u`), SyntaxError);
  assertThrowsInstanceOf(() => eval(`/\\u{110000}/u`), SyntaxError);
  assertThrowsInstanceOf(() => eval(`/\\u{00110000}/u`), SyntaxError);
  assertThrowsInstanceOf(() => eval(`/\\u{100000000000000000000000000000}/u`), SyntaxError);
  assertThrowsInstanceOf(() => eval(`/\\u{FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF}/u`), SyntaxError);
  assertThrowsInstanceOf(() => eval(`/\\u{   FFFF}/u`), SyntaxError);
  assertThrowsInstanceOf(() => eval(`/\\u{FFFF   }/u`), SyntaxError);
  assertThrowsInstanceOf(() => eval(`/\\u{FF   FF}/u`), SyntaxError);
  assertThrowsInstanceOf(() => eval(`/\\u{F F F F}/u`), SyntaxError);
  assertThrowsInstanceOf(() => eval(`/\\u{100000001}/u`), SyntaxError);
  
  // surrogate pair with braced
  assertEq(/\u{D83D}\u{DC38}+/u.exec("\uD83D\uDC38\uDC38"),
           null);
  assertEq(/\uD83D\u{DC38}+/u.exec("\uD83D\uDC38\uDC38"),
           null);
  assertEq(/\u{D83D}\uDC38+/u.exec("\uD83D\uDC38\uDC38"),
           null);
  
  if (typeof reportCompare === "function")
      reportCompare(true, true);
  