tests/cases/conformance/es6/unicodeExtendedEscapes/unicodeExtendedEscapesInStrings12_ES5.ts(2,21): error TS1198: An extended Unicode escape value must be between 0x0 and 0x10FFFF inclusive.
==== tests/cases/conformance/es6/unicodeExtendedEscapes/unicodeExtendedEscapesInStrings12_ES5.ts (1 errors) ====
var x = "\u{FFFFFFFF}";
!!! error TS1198: An extended Unicode escape value must be between 0x0 and 0x10FFFF inclusive.