Find bugs in JavaScript programs.

E0023: keywords cannot contain escape sequences

Outside a string or template literal, Unicode escape sequences (like \u{65}) can be used in identifiers. However, Unicode escape sequences are not allowed if they would make an identifier look like a keyword when unescaped:

let \u{69}\u{66} = "if";
let which = \u{66}inally;

To fix this error, either pick a different variable name, or make a string:

let _\u{69}\u{66} = "if";
let which = "\u{66}inally";

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