PS> 1.000.000.000
PS> # NOT RETURN ANYTHGING

PS> perl6 -e 'say 1_000_000_000'
1000000000


PS> @'
>> fn main() {
>>  let s = 1_000_000_000;
>>  println!("{}",s);
>> }
>> '@ > ./num.rs

PS> rustc .\num.rs

PS> ./num.exe
1000000000