chore: Move folder to dedicated chapter

1-hello-world/debug/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "debug"
+version = "0.1.0"

1-hello-world/debug/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "debug"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

1-hello-world/debug/src/main.rs

@@ -0,0 +1,49 @@
+// This structure cannot be printed either with `fmt::Display` or
+// with `fmt::Debug`.
+struct UnPrintable(i32);
+
+// The `derive` attribute automatically creates the implementation
+// required to make this `struct` printable with `fmt::Debug`.
+#[derive(Debug)]
+struct DebugPrintable(i32);
+
+// Derive the `fmt::Debug` implementation for `Structure`. `Structure`
+// is a structure which contains a single `i32`.
+#[derive(Debug)]
+struct Structure(i32);
+
+// Put a `Structure` inside of the structure `Deep`. Make it printable
+// also.
+#[derive(Debug)]
+struct Deep(Structure);
+
+#[derive(Debug)]
+struct Person<'a> {
+    name: &'a str,
+    age: u8
+}
+
+fn main() {
+    // Printing with `{:?}` is similar to with `{}`.
+    println!("{:?} months in a year.", 12);
+    println!("{1:?} {0:?} is the {actor:?} name.",
+             "Slater",
+             "Christian",
+             actor="actor's");
+
+    // `Structure` is printable!
+    println!("Now {:?} will print!", Structure(3));
+
+    // The problem with `derive` is there is no control over how
+    // the results look. What if I want this to just show a `7`?
+    println!("Now {:?} will print!", Deep(Structure(7)));
+
+    // `fmt::Debug` deinitely makes this printable but sacrifice some elegance.
+    // Rust also provide "pretty print" with `{:#?}`.
+    let name = "Peter";
+    let age = 27;
+    let peter = Person { name, age };
+
+    // Pretty print
+    println!("{:#?}", peter);
+}

1-hello-world/debug/target/.rustc_info.json

@@ -0,0 +1 @@
+{"rustc_fingerprint":14802351894921902018,"outputs":{"7971740275564407648":{"success":true,"status":"","code":0,"stdout":"___\nlib___.rlib\nlib___.so\nlib___.so\nlib___.a\nlib___.so\n/home/nak/.rustup/toolchains/stable-x86_64-unknown-linux-gnu\noff\npacked\nunpacked\n___\ndebug_assertions\npanic=\"unwind\"\nproc_macro\ntarget_abi=\"\"\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"gnu\"\ntarget_family=\"unix\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_has_atomic=\"16\"\ntarget_has_atomic=\"32\"\ntarget_has_atomic=\"64\"\ntarget_has_atomic=\"8\"\ntarget_has_atomic=\"ptr\"\ntarget_has_atomic_primitive_alignment=\"16\"\ntarget_has_atomic_primitive_alignment=\"32\"\ntarget_has_atomic_primitive_alignment=\"64\"\ntarget_has_atomic_primitive_alignment=\"8\"\ntarget_has_atomic_primitive_alignment=\"ptr\"\ntarget_os=\"linux\"\ntarget_pointer_width=\"64\"\ntarget_vendor=\"unknown\"\nunix\n","stderr":""},"1847801304416329599":{"success":true,"status":"","code":0,"stdout":"rustc 1.98.1 (48a229cea 2026-09-01)\nbinary: rustc\ncommit-hash: 48a229ceaefd4985c50990b14116b6d856af0985\ncommit-date: 2026-09-01\nhost: x86_64-unknown-linux-gnu\nrelease: 1.98.1\nLLVM version: 22.1.8\n","stderr":""}},"successes":{}}

1-hello-world/debug/target/CACHEDIR.TAG

@@ -0,0 +1,3 @@
+Signature: 8a477f597d28d172789f06886806bc55
+# This file is a cache directory tag created by cargo.
+# For information about cache directory tags see https://bford.info/cachedir/

1-hello-world/debug/target/debug/.fingerprint/debug-5a1b483393417d95/bin-debug

@@ -0,0 +1 @@
+dc3015345aa383a3

1-hello-world/debug/target/debug/.fingerprint/debug-5a1b483393417d95/bin-debug.json

@@ -0,0 +1 @@
+{"rustc":1625334936438085654,"features":"[]","declared_features":"[]","target":2484616488665672794,"profile":8731458305071235362,"path":4942398508502643691,"deps":[],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/debug-5a1b483393417d95/dep-bin-debug","checksum":false}}],"rustflags":[],"config":9396254390672932401,"compile_kind":0}

1-hello-world/debug/target/debug/.fingerprint/debug-5a1b483393417d95/invoked.timestamp

@@ -0,0 +1 @@
+This file has an mtime of when this was started.

1-hello-world/debug/target/debug/.fingerprint/debug-5a1b483393417d95/output-bin-debug

@@ -0,0 +1,6 @@
+{"$message_type":"diagnostic","message":"struct `UnPrintable` is never constructed","code":{"code":"dead_code","explanation":null},"level":"warning","spans":[{"file_name":"src/main.rs","byte_start":95,"byte_end":106,"line_start":3,"line_end":3,"column_start":8,"column_end":19,"is_primary":true,"text":[{"text":"struct UnPrintable(i32);","highlight_start":8,"highlight_end":19}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"`#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"\u001b[1m\u001b[33mwarning\u001b[0m\u001b[1m: struct `UnPrintable` is never constructed\u001b[0m\n \u001b[1m\u001b[94m--> \u001b[0msrc/main.rs:3:8\n  \u001b[1m\u001b[94m|\u001b[0m\n\u001b[1m\u001b[94m3\u001b[0m \u001b[1m\u001b[94m|\u001b[0m struct UnPrintable(i32);\n  \u001b[1m\u001b[94m|\u001b[0m        \u001b[1m\u001b[33m^^^^^^^^^^^\u001b[0m\n  \u001b[1m\u001b[94m|\u001b[0m\n  \u001b[1m\u001b[94m= \u001b[0m\u001b[1mnote\u001b[0m: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default\n\n"}
+{"$message_type":"diagnostic","message":"struct `DebugPrintable` is never constructed","code":{"code":"dead_code","explanation":null},"level":"warning","spans":[{"file_name":"src/main.rs","byte_start":268,"byte_end":282,"line_start":8,"line_end":8,"column_start":8,"column_end":22,"is_primary":true,"text":[{"text":"struct DebugPrintable(i32);","highlight_start":8,"highlight_end":22}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[],"rendered":"\u001b[1m\u001b[33mwarning\u001b[0m\u001b[1m: struct `DebugPrintable` is never constructed\u001b[0m\n \u001b[1m\u001b[94m--> \u001b[0msrc/main.rs:8:8\n  \u001b[1m\u001b[94m|\u001b[0m\n\u001b[1m\u001b[94m8\u001b[0m \u001b[1m\u001b[94m|\u001b[0m struct DebugPrintable(i32);\n  \u001b[1m\u001b[94m|\u001b[0m        \u001b[1m\u001b[33m^^^^^^^^^^^^^^\u001b[0m\n\n"}
+{"$message_type":"diagnostic","message":"field `0` is never read","code":{"code":"dead_code","explanation":null},"level":"warning","spans":[{"file_name":"src/main.rs","byte_start":434,"byte_end":443,"line_start":13,"line_end":13,"column_start":8,"column_end":17,"is_primary":false,"text":[{"text":"struct Structure(i32);","highlight_start":8,"highlight_end":17}],"label":"field in this struct","suggested_replacement":null,"suggestion_applicability":null,"expansion":null},{"file_name":"src/main.rs","byte_start":444,"byte_end":447,"line_start":13,"line_end":13,"column_start":18,"column_end":21,"is_primary":true,"text":[{"text":"struct Structure(i32);","highlight_start":18,"highlight_end":21}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"consider removing this field","code":null,"level":"help","spans":[],"children":[],"rendered":null},{"message":"`Structure` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"\u001b[1m\u001b[33mwarning\u001b[0m\u001b[1m: field `0` is never read\u001b[0m\n  \u001b[1m\u001b[94m--> \u001b[0msrc/main.rs:13:18\n   \u001b[1m\u001b[94m|\u001b[0m\n\u001b[1m\u001b[94m13\u001b[0m \u001b[1m\u001b[94m|\u001b[0m struct Structure(i32);\n   \u001b[1m\u001b[94m|\u001b[0m        \u001b[1m\u001b[94m---------\u001b[0m \u001b[1m\u001b[33m^^^\u001b[0m\n   \u001b[1m\u001b[94m|\u001b[0m        \u001b[1m\u001b[94m|\u001b[0m\n   \u001b[1m\u001b[94m|\u001b[0m        \u001b[1m\u001b[94mfield in this struct\u001b[0m\n   \u001b[1m\u001b[94m|\u001b[0m\n   \u001b[1m\u001b[94m= \u001b[0m\u001b[1mhelp\u001b[0m: consider removing this field\n   \u001b[1m\u001b[94m= \u001b[0m\u001b[1mnote\u001b[0m: `Structure` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis\n\n"}
+{"$message_type":"diagnostic","message":"field `0` is never read","code":{"code":"dead_code","explanation":null},"level":"warning","spans":[{"file_name":"src/main.rs","byte_start":555,"byte_end":559,"line_start":18,"line_end":18,"column_start":8,"column_end":12,"is_primary":false,"text":[{"text":"struct Deep(Structure);","highlight_start":8,"highlight_end":12}],"label":"field in this struct","suggested_replacement":null,"suggestion_applicability":null,"expansion":null},{"file_name":"src/main.rs","byte_start":560,"byte_end":569,"line_start":18,"line_end":18,"column_start":13,"column_end":22,"is_primary":true,"text":[{"text":"struct Deep(Structure);","highlight_start":13,"highlight_end":22}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"consider removing this field","code":null,"level":"help","spans":[],"children":[],"rendered":null},{"message":"`Deep` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"\u001b[1m\u001b[33mwarning\u001b[0m\u001b[1m: field `0` is never read\u001b[0m\n  \u001b[1m\u001b[94m--> \u001b[0msrc/main.rs:18:13\n   \u001b[1m\u001b[94m|\u001b[0m\n\u001b[1m\u001b[94m18\u001b[0m \u001b[1m\u001b[94m|\u001b[0m struct Deep(Structure);\n   \u001b[1m\u001b[94m|\u001b[0m        \u001b[1m\u001b[94m----\u001b[0m \u001b[1m\u001b[33m^^^^^^^^^\u001b[0m\n   \u001b[1m\u001b[94m|\u001b[0m        \u001b[1m\u001b[94m|\u001b[0m\n   \u001b[1m\u001b[94m|\u001b[0m        \u001b[1m\u001b[94mfield in this struct\u001b[0m\n   \u001b[1m\u001b[94m|\u001b[0m\n   \u001b[1m\u001b[94m= \u001b[0m\u001b[1mhelp\u001b[0m: consider removing this field\n   \u001b[1m\u001b[94m= \u001b[0m\u001b[1mnote\u001b[0m: `Deep` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis\n\n"}
+{"$message_type":"diagnostic","message":"fields `name` and `age` are never read","code":{"code":"dead_code","explanation":null},"level":"warning","spans":[{"file_name":"src/main.rs","byte_start":597,"byte_end":603,"line_start":21,"line_end":21,"column_start":8,"column_end":14,"is_primary":false,"text":[{"text":"struct Person<'a> {","highlight_start":8,"highlight_end":14}],"label":"fields in this struct","suggested_replacement":null,"suggestion_applicability":null,"expansion":null},{"file_name":"src/main.rs","byte_start":614,"byte_end":618,"line_start":22,"line_end":22,"column_start":5,"column_end":9,"is_primary":true,"text":[{"text":"    name: &'a str,","highlight_start":5,"highlight_end":9}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null},{"file_name":"src/main.rs","byte_start":633,"byte_end":636,"line_start":23,"line_end":23,"column_start":5,"column_end":8,"is_primary":true,"text":[{"text":"    age: u8","highlight_start":5,"highlight_end":8}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"`Person` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"\u001b[1m\u001b[33mwarning\u001b[0m\u001b[1m: fields `name` and `age` are never read\u001b[0m\n  \u001b[1m\u001b[94m--> \u001b[0msrc/main.rs:22:5\n   \u001b[1m\u001b[94m|\u001b[0m\n\u001b[1m\u001b[94m21\u001b[0m \u001b[1m\u001b[94m|\u001b[0m struct Person<'a> {\n   \u001b[1m\u001b[94m|\u001b[0m        \u001b[1m\u001b[94m------\u001b[0m \u001b[1m\u001b[94mfields in this struct\u001b[0m\n\u001b[1m\u001b[94m22\u001b[0m \u001b[1m\u001b[94m|\u001b[0m     name: &'a str,\n   \u001b[1m\u001b[94m|\u001b[0m     \u001b[1m\u001b[33m^^^^\u001b[0m\n\u001b[1m\u001b[94m23\u001b[0m \u001b[1m\u001b[94m|\u001b[0m     age: u8\n   \u001b[1m\u001b[94m|\u001b[0m     \u001b[1m\u001b[33m^^^\u001b[0m\n   \u001b[1m\u001b[94m|\u001b[0m\n   \u001b[1m\u001b[94m= \u001b[0m\u001b[1mnote\u001b[0m: `Person` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis\n\n"}
+{"$message_type":"diagnostic","message":"5 warnings emitted","code":null,"level":"warning","spans":[],"children":[],"rendered":"\u001b[1m\u001b[33mwarning\u001b[0m\u001b[1m: 5 warnings emitted\u001b[0m\n\n"}

1-hello-world/debug/target/debug/debug.d

@@ -0,0 +1 @@
+/home/nak/Code/rust/learn-rust/debug/target/debug/debug: /home/nak/Code/rust/learn-rust/debug/src/main.rs

1-hello-world/debug/target/debug/deps/debug-5a1b483393417d95.d

@@ -0,0 +1,5 @@
+/home/nak/Code/rust/learn-rust/debug/target/debug/deps/debug-5a1b483393417d95.d: src/main.rs
+
+/home/nak/Code/rust/learn-rust/debug/target/debug/deps/debug-5a1b483393417d95: src/main.rs
+
+src/main.rs: