initial commit

exercises/04_traits/08_sized/Cargo.toml

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+[package]
+name = "sized"
+version = "0.1.0"
+edition = "2021"

exercises/04_traits/08_sized/src/lib.rs

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+pub fn example() {
+    // Trying to get the size of a str (or any other DST)
+    // via `std::mem::size_of` will result in a compile-time error.
+    //
+    // TODO: Comment out the following line and move on to the next exercise.
+    std::mem::size_of::<str>();
+}