src/tools/clippy/src/docs/zero_prefixed_literal.txt

   1 ### What it does
   2 Warns if an integral constant literal starts with `0`.
   3
   4 ### Why is this bad?
   5 In some languages (including the infamous C language
   6 and most of its
   7 family), this marks an octal constant. In Rust however, this is a decimal
   8 constant. This could
   9 be confusing for both the writer and a reader of the constant.
  10
  11 ### Example
  12
  13 In Rust:
  14 ```
  15 fn main() {
  16     let a = 0123;
  17     println!("{}", a);
  18 }
  19 ```
  20
  21 prints `123`, while in C:
  22
  23 ```
  24 #include <stdio.h>
  25
  26 int main() {
  27     int a = 0123;
  28     printf("%d\n", a);
  29 }
  30 ```
  31
  32 prints `83` (as `83 == 0o123` while `123 == 0o173`).