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### What it does
Warns if an integral constant literal starts with `0`.
### Why is this bad?
In some languages (including the infamous C language
and most of its
family), this marks an octal constant. In Rust however, this is a decimal
constant. This could
be confusing for both the writer and a reader of the constant.
### Example
In Rust:
```
fn main() {
let a = 0123;
println!("{}", a);
}
```
prints `123`, while in C:
```
#include <stdio.h>
int main() {
int a = 0123;
printf("%d\n", a);
}
```
prints `83` (as `83 == 0o123` while `123 == 0o173`).
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