Binary palindromes in Rust

palindromes.rs

fn bin_reverse(n_orig: u32) -> u32 {
  let mut n = n_orig;

  n = ((n & 0xFFFF0000) >> 16) | ((n & 0x0000FFFF) << 16 );
  n = ((n & 0xFF00FF00) >> 8 ) | ((n & 0x00FF00FF) << 8 );
  n = ((n & 0xF0F0F0F0) >> 4 ) | ((n & 0x0F0F0F0F) << 4 );
  n = ((n & 0xCCCCCCCC) >> 2 ) | ((n & 0x33333333) << 2 );
  n = ((n & 0xAAAAAAAA) >> 1 ) | ((n & 0x55555555) << 1 );

  n
}

fn is_palindrome(n: u32) -> bool {
  n == bin_reverse(n) >> n.leading_zeros()
}

fn main() {
  let res: Vec<_> = (1900..2100).filter(|&n| is_palindrome(n)).collect();
  println!("{:?}", res);
}