const std = #import("std");
const assert = std.assert;

const main = fn() s32 {
    var buffer: [65]u8 = undefined;
    const slice = foo(5, buffer.&);
    assert(slice.len + 5 == buffer.len);
    const result: u32 = #cast(slice.len + 5 - buffer.len);
    return #cast(result);
}
const foo = fn(n: usize, buffer: &[65]u8) []u8 {
    return buffer[n..];
}