=== tests/cases/conformance/es6/unicodeExtendedEscapes/unicodeExtendedEscapesInRegularExpressions12_ES6.ts ===

var x = /\u{FFFFFFFF}/g;
>x : Symbol(x, Decl(unicodeExtendedEscapesInRegularExpressions12_ES6.ts, 1, 3))