E0050: hex number literal has no digits

Hexadecimal (hex) number literals start with 0x and require at least one digit. It is an error to write 0x with no following digits:

let mask = 0x

To fix this error, write digits after 0x:

let mask = 0xff00;

Alternatively, remove x to create a 0 number literal.

Introduced in quick-lint-js version 0.2.0.