diff --git a/hands-on_dlang.md b/hands-on_dlang.md
index ad47ff8..218bc33 100644
--- a/hands-on_dlang.md
+++ b/hands-on_dlang.md
@@ -1,90 +1,89 @@
 # Hands-On DLang
 
-* [Hands-On DLang](#hands-on-dlang)
-    * [Setup](#setup)
-        * [Installing DMD and DUB](#installing-dmd-and-dub)
-            * [OS X](#os-x)
-                * [Installing with Homebrew (recommended)](#installing-with-homebrew-recommended)
-                * [Installing locally using the install script](#installing-locally-using-the-install-script)
-                * [Installing using the installer](#installing-using-the-installer)
-            * [Windows](#windows)
-        * [Recommended editor setup](#recommended-editor-setup)
-            * [Installation of Visual Studio Code](#installation-of-visual-studio-code)
-            * [Extension setup](#extension-setup)
-        * [Project setup and compiling](#project-setup-and-compiling)
-            * [Without DUB](#without-dub)
-            * [With DUB](#with-dub)
-    * [Basics](#basics)
-        * [Hello World](#hello-world)
-        * [Imports and modules](#imports-and-modules)
-            * [Selective imports](#selective-imports)
-            * [Scoped imports](#scoped-imports)
-            * [Imports match files and directories](#imports-match-files-and-directories)
-        * [Basic Types](#basic-types)
-            * [Type conversion](#type-conversion)
-            * [Type properties](#type-properties)
-            * [Indexing](#indexing)
-        * [Variable declarations](#variable-declarations)
-        * [Mutability](#mutability)
-            * [`immutable`](#immutable)
-            * [`const`](#const)
-        * [Functions](#functions)
-            * [Return type deduction](#return-type-deduction)
-            * [Default arguments](#default-arguments)
-            * [Local functions](#local-functions)
-        * [Memory and pointers](#memory-and-pointers)
-            * [Memory safety](#memory-safety)
-        * [Structs](#structs)
-            * [Member functions](#member-functions)
-            * [`const` member functions](#const-member-functions)
-            * [`static` member functions](#static-member-functions)
-        * [Arrays](#arrays)
-            * [Static arrays](#static-arrays)
-            * [Dynamic arrays](#dynamic-arrays)
-            * [Array operations and properties](#array-operations-and-properties)
-        * [Slices](#slices)
-        * [Alias and `string`s](#alias-and-strings)
-        * [Control flow](#control-flow)
-            * [if…else](#ifelse)
-            * [switch…case](#switchcase)
-            * [Old fashioned loops](#old-fashioned-loops)
-                * [Breaking out of outer loops](#breaking-out-of-outer-loops)
-            * [`foreach` loops](#foreach-loops)
-                * [Element iteration](#element-iteration)
-                * [Access by reference](#access-by-reference)
-                * [Iterate `n` times](#iterate-n-times)
-                * [Iteration with index counter](#iteration-with-index-counter)
-        * [Ranges](#ranges)
-            * [Laziness](#laziness)
-            * [Copying ranges](#copying-ranges)
-            * [`RandomAccessRange`s](#randomaccessranges)
-            * [Lazy range algorithms](#lazy-range-algorithms)
-        * [Associative arrays](#associative-arrays)
-        * [Classes](#classes)
-            * [Inheritance](#inheritance)
-            * [Final and abstract member functions](#final-and-abstract-member-functions)
-            * [Checking for identity](#checking-for-identity)
-        * [Interfaces](#interfaces)
-        * [Templates](#templates)
-            * [Template functions](#template-functions)
-            * [Other templates](#other-templates)
-            * [Template value parameters](#template-value-parameters)
-            * [Other template parameters](#other-template-parameters)
-        * [Delegates](#delegates)
-            * [Functions as arguments](#functions-as-arguments)
-            * [Local functions with context](#local-functions-with-context)
-            * [Anonymous functions and lambdas](#anonymous-functions-and-lambdas)
-        * [Exceptions](#exceptions)
-            * [`nothrow`](#nothrow)
-    * [Gems](#gems)
-        * [Uniform function call syntax (UFCS)](#uniform-function-call-syntax-ufcs)
-        * [Scope guards](#scope-guards)
-        * [Range algorithms](#range-algorithms)
-        * [Unittesting](#unittesting)
-            * [Example](#example)
-            * [Executing unittests](#executing-unittests)
-            * [Code coverage](#code-coverage)
-        * [String mixins](#string-mixins)
+* [Setup](#setup)
+    * [Installing DMD and DUB](#installing-dmd-and-dub)
+        * [OS X](#os-x)
+            * [Installing with Homebrew (recommended)](#installing-with-homebrew-recommended)
+            * [Installing locally using the install script](#installing-locally-using-the-install-script)
+            * [Installing using the installer](#installing-using-the-installer)
+        * [Windows](#windows)
+    * [Recommended editor setup](#recommended-editor-setup)
+        * [Installation of Visual Studio Code](#installation-of-visual-studio-code)
+        * [Extension setup](#extension-setup)
+    * [Project setup and compiling](#project-setup-and-compiling)
+        * [Without DUB](#without-dub)
+        * [With DUB](#with-dub)
+* [Basics](#basics)
+    * [Hello World](#hello-world)
+    * [Imports and modules](#imports-and-modules)
+        * [Selective imports](#selective-imports)
+        * [Scoped imports](#scoped-imports)
+        * [Imports match files and directories](#imports-match-files-and-directories)
+    * [Basic Types](#basic-types)
+        * [Type conversion](#type-conversion)
+        * [Type properties](#type-properties)
+        * [Indexing](#indexing)
+    * [Variable declarations](#variable-declarations)
+    * [Mutability](#mutability)
+        * [`immutable`](#immutable)
+        * [`const`](#const)
+    * [Functions](#functions)
+        * [Return type deduction](#return-type-deduction)
+        * [Default arguments](#default-arguments)
+        * [Local functions](#local-functions)
+    * [Memory and pointers](#memory-and-pointers)
+        * [Memory safety](#memory-safety)
+    * [Structs](#structs)
+        * [Member functions](#member-functions)
+        * [`const` member functions](#const-member-functions)
+        * [`static` member functions](#static-member-functions)
+    * [Arrays](#arrays)
+        * [Static arrays](#static-arrays)
+        * [Dynamic arrays](#dynamic-arrays)
+        * [Array operations and properties](#array-operations-and-properties)
+    * [Slices](#slices)
+    * [Alias and `string`s](#alias-and-strings)
+    * [Control flow](#control-flow)
+        * [if…else](#ifelse)
+        * [switch…case](#switchcase)
+        * [Old fashioned loops](#old-fashioned-loops)
+            * [Breaking out of outer loops](#breaking-out-of-outer-loops)
+        * [`foreach` loops](#foreach-loops)
+            * [Element iteration](#element-iteration)
+            * [Access by reference](#access-by-reference)
+            * [Iterate `n` times](#iterate-n-times)
+            * [Iteration with index counter](#iteration-with-index-counter)
+    * [Ranges](#ranges)
+        * [Laziness](#laziness)
+        * [Copying ranges](#copying-ranges)
+        * [`RandomAccessRange`s](#randomaccessranges)
+        * [Lazy range algorithms](#lazy-range-algorithms)
+    * [Associative arrays](#associative-arrays)
+    * [Classes](#classes)
+        * [Inheritance](#inheritance)
+        * [Final and abstract member functions](#final-and-abstract-member-functions)
+        * [Checking for identity](#checking-for-identity)
+    * [Interfaces](#interfaces)
+    * [Templates](#templates)
+        * [Template functions](#template-functions)
+        * [Other templates](#other-templates)
+        * [Template value parameters](#template-value-parameters)
+        * [Other template parameters](#other-template-parameters)
+    * [Delegates](#delegates)
+        * [Functions as arguments](#functions-as-arguments)
+        * [Local functions with context](#local-functions-with-context)
+        * [Anonymous functions and lambdas](#anonymous-functions-and-lambdas)
+    * [Exceptions](#exceptions)
+        * [`nothrow`](#nothrow)
+* [Gems](#gems)
+    * [Uniform function call syntax (UFCS)](#uniform-function-call-syntax-ufcs)
+    * [Scope guards](#scope-guards)
+    * [Range algorithms](#range-algorithms)
+    * [Unittesting](#unittesting)
+        * [Example](#example)
+        * [Executing unittests](#executing-unittests)
+        * [Code coverage](#code-coverage)
+    * [String mixins](#string-mixins)
 
 ## Setup