Demonstrate the use of the dbg macro

rectangles/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "rectangles"
+version = "0.1.0"

rectangles/Cargo.toml

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+[package]
+name = "rectangles"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

rectangles/src/main.rs

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+#[derive(Debug)]
+struct Rectangle {
+    width: u32,
+    height: u32,
+}
+
+fn main() {
+    let scale = 2;
+    let rect1 = Rectangle {
+        width: dbg!(30 * scale),
+        height: 50,
+    };
+
+    dbg!(&rect1);
+}