Digit outside the literal's base

Built from the repository at commit a8614dc.

A hexadecimal literal uses the digits 0-9, a-f and A-F, a binary literal uses 0 and 1, and an octal literal uses 0-7. Any other letter or digit after the prefix is an error, reported at that character.

Why

A digit that the base does not have has no value there. 0b102 would be a typo for a binary number, or a decimal number written with the wrong prefix, and the compiler cannot tell which.

Broken

fn main() {
    let n = 0xFG
    print(n)
}

What sisu says

error[E0077]: `G` is not a hexadecimal digit
 --> E0077.sisu:2:16
  |
2 |     let n = 0xFG
  |                ^

sisu: 1 error
sisu: for more on a code, run `sisu explain <code>`: E0077

Fixed

fn main() {
    let n = 0xFF
    print(n)
}

Related

• E0008: a _ outside digits.