Find bugs in JavaScript programs.

E0038: unclosed identifier escape sequence

Identifiers can contain Unicode escape sequences starting with \u. It is a syntax error to write \u{ followed by hexadecimal digits without a closing }:

let guitar\u{3604 = "\u{D83C}\u{";

To fix this error, write } to close the escape sequence.

let guitar\u{3604} = "\u{D83C}\u{DFB8}";

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