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";
Introduced in quick-lint-js version 0.2.0.