Poking the Rust 🦀 Borrow Checker.

rust_mutable_with_immut_bounds.rs

// ❌ snippet_a
// This wouldn't work in Rust compiler because we're trying to change immutable data in memory
// https://doc.rust-lang.org/book/ch03-01-variables-and-mutability.html#variables-and-mutability
// Look at the fix in *snippet_b*
let mut_data:Vec<(),()> = Vec::new();
for datum in set_of_data {
  mut_data.push(datum);
}

// ✅ snippet_b 
let mut mut_data:Vec<(),()> = Vec::new();
for datum in set_of_data {
  mut_data.push(datum);
}

// snippet_c
// In *snippet_b* we had to make the variable mutable to modify the value in memory
// we can see how we manipulated the immutable data in "immut_data"
// do you think this trick would work? 🤔
let data_set = {
  let immut_data:Vec<(),()> = Vec::new(); // 🦀
    for datum in set_of_data {
      immut_data.push(datum);
    }
  immut_data
}