swc/crates/swc_ecma_parser/tests/tsc/unicodeExtendedEscapesInStrings10_ES6.ts

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// @target: es6
// ES6 Spec - 10.1.1 Static Semantics: UTF16Encoding (cp)
// 2. Let cu1 be floor((cp 65536) / 1024) + 0xD800.
// Although we should just get back a single code point value of 0xD800,
// this is a useful edge-case test.
var x = "\u{D800}";