E0043: unexpected '\' in identifier
Identifiers (variable names, etc.) can contain Unicode escape sequences
(\u{69}
for example). It is an error for an identifier to have a backslash
which is not part of a Unicode escape sequence:
function identity\(x) { return x; }
let bird\U3600 = new ChirpSound();
To fix this error, remove the backslash, or complete the Unicode escape sequence:
function identity(x) { return x; }
let bird\u3600 = new ChirpSound();
Introduced in quick-lint-js version 0.2.0.