type name `int` is undefined or not in scope

Question

What does this mean?

error: type name `int` is undefined or not in scope

I am trying to compile this example:

fn minval(A: &[int]) -> int {
  A.iter().fold(A[0], |u,&a| {
    if a<u {a} else {u}
  })
}

fn main() {
    let A = [1i,2i,3i];
    let min = minval(A.as_slice());
    println!("{}", min);
}

Answer 1

There is no int type in Rust. Rust has the following integer types:

• i8, i16, i32, i64, i128: signed integer with 8/16/32/64/128 bits
• u8, u16, u32, u64, u128: unsigned integer with 8/16/32/64/128 bits
• isize, usize: signed/unsigned integer with pointer size (64 bit on 64 bit systems)

You can learn more about this in this chapter of the Rust book.