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-                <ol class="chapter"><li class="chapter-item expanded affix "><a href="../index.html">The Puck Programming Language</a></li><li class="chapter-item expanded "><a href="OVERVIEW.html"><strong aria-hidden="true">1.</strong> Basic Usage</a></li><li><ol class="section"><li class="chapter-item expanded "><div><strong aria-hidden="true">1.1.</strong> Variables and Comments</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">1.2.</strong> Basic Types</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">1.3.</strong> Functions and Calls</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">1.4.</strong> Boolean and Integer Operations</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">1.5.</strong> Conditionals and Control Flow</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">1.6.</strong> Error Handling</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">1.7.</strong> Loops and Iterators</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">1.8.</strong> Modules</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">1.9.</strong> Compile-time Programming</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">1.10.</strong> Async and Threading</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">1.11.</strong> Advanced Types</div></li></ol></li><li class="chapter-item expanded "><a href="SYNTAX.html"><strong aria-hidden="true">2.</strong> Syntax</a></li><li><ol class="section"><li class="chapter-item expanded "><div><strong aria-hidden="true">2.1.</strong> Indentation Rules [todo]</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">2.2.</strong> Reserved Keywords</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">2.3.</strong> A Formal Grammar</div></li></ol></li><li class="chapter-item expanded "><a href="TYPES.html"><strong aria-hidden="true">3.</strong> Type System</a></li><li><ol class="section"><li class="chapter-item expanded "><div><strong aria-hidden="true">3.1.</strong> Basic Types</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">3.2.</strong> Parameter Types</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">3.3.</strong> Reference Types</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">3.4.</strong> Abstract Types</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">3.5.</strong> Advanced Types</div></li></ol></li><li class="chapter-item expanded "><a href="MODULES.html" class="active"><strong aria-hidden="true">4.</strong> Module System</a></li><li><ol class="section"><li class="chapter-item expanded "><div><strong aria-hidden="true">4.1.</strong> Using Modules</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">4.2.</strong> Implicit Modules</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">4.3.</strong> Defining Module Interfaces [todo]</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">4.4.</strong> Defining an External API [todo]</div></li></ol></li><li class="chapter-item expanded "><a href="ERRORS.html"><strong aria-hidden="true">5.</strong> Error Handling</a></li><li><ol class="section"><li class="chapter-item expanded "><div><strong aria-hidden="true">5.1.</strong> Errors as Monads</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">5.2.</strong> Errors as Catchable Exceptions</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">5.3.</strong> Errors and Void Functions [todo]</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">5.4.</strong> Unrecoverable Exceptions</div></li></ol></li><li class="chapter-item expanded "><a href="ASYNC.html"><strong aria-hidden="true">6.</strong> Async System</a></li><li><ol class="section"><li class="chapter-item expanded "><div><strong aria-hidden="true">6.1.</strong> Threading [todo]</div></li></ol></li><li class="chapter-item expanded "><a href="METAPROGRAMMING.html"><strong aria-hidden="true">7.</strong> Metaprogramming</a></li><li class="chapter-item expanded "><div><strong aria-hidden="true">8.</strong> Memory Management [todo]</div></li><li><ol class="section"><li class="chapter-item expanded "><div><strong aria-hidden="true">8.1.</strong> Reference Counting Optimizations</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">8.2.</strong> Annotations and Ownership</div></li></ol></li><li class="chapter-item expanded "><a href="INTEROP.html"><strong aria-hidden="true">9.</strong> Language Interop [draft]</a></li><li><ol class="section"><li class="chapter-item expanded "><div><strong aria-hidden="true">9.1.</strong> Rust, Swift, Nim</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">9.2.</strong> Java, Kotlin</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">9.3.</strong> Python, Racket, C</div></li></ol></li><li class="chapter-item expanded "><div><strong aria-hidden="true">10.</strong> Refinement Types [draft]</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">11.</strong> Dependent Types [draft]</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">12.</strong> Effects System [draft]</div></li></ol>
+                <ol class="chapter"><li class="chapter-item expanded affix "><a href="../index.html">The Puck Programming Language</a></li><li class="chapter-item expanded "><a href="OVERVIEW.html"><strong aria-hidden="true">1.</strong> Basic Usage</a></li><li><ol class="section"><li class="chapter-item expanded "><div><strong aria-hidden="true">1.1.</strong> Variables and Comments</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">1.2.</strong> Functions and Indentation</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">1.3.</strong> Uniform Function Call Syntax</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">1.4.</strong> Basic Types</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">1.5.</strong> Conditionals and Pattern Matching</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">1.6.</strong> Error Handling</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">1.7.</strong> Blocks and Loops</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">1.8.</strong> Module System</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">1.9.</strong> Compile-time Programming</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">1.10.</strong> Async System and Threading</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">1.11.</strong> Memory Management</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">1.12.</strong> Types System</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">1.13.</strong> Structs and Tuples</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">1.14.</strong> Unions and Enums</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">1.15.</strong> Classes</div></li></ol></li><li class="chapter-item expanded "><a href="SYNTAX.html"><strong aria-hidden="true">2.</strong> Syntax</a></li><li><ol class="section"><li class="chapter-item expanded "><div><strong aria-hidden="true">2.1.</strong> Call Syntax</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">2.2.</strong> Indentation Rules</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">2.3.</strong> Expression Rules</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">2.4.</strong> Reserved Keywords</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">2.5.</strong> A Formal Grammar</div></li></ol></li><li class="chapter-item expanded "><a href="TYPES.html"><strong aria-hidden="true">3.</strong> Type System</a></li><li><ol class="section"><li class="chapter-item expanded "><div><strong aria-hidden="true">3.1.</strong> Basic Types</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">3.2.</strong> Parameter Types</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">3.3.</strong> Reference Types</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">3.4.</strong> Abstract Types</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">3.5.</strong> Advanced Types</div></li></ol></li><li class="chapter-item expanded "><a href="MODULES.html" class="active"><strong aria-hidden="true">4.</strong> Module System</a></li><li><ol class="section"><li class="chapter-item expanded "><div><strong aria-hidden="true">4.1.</strong> What are modules?</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">4.2.</strong> Using modules</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">4.3.</strong> Implicit modules</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">4.4.</strong> Defining interfaces [todo]</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">4.5.</strong> Defining an external API [todo]</div></li></ol></li><li class="chapter-item expanded "><a href="MEMORY_MANAGEMENT.html"><strong aria-hidden="true">5.</strong> Memory Management [todo]</a></li><li class="chapter-item expanded "><a href="METAPROGRAMMING.html"><strong aria-hidden="true">6.</strong> Metaprogramming</a></li><li><ol class="section"><li class="chapter-item expanded "><div><strong aria-hidden="true">6.1.</strong> Scope</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">6.2.</strong> Usage</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">6.3.</strong> Quoting [todo]</div></li></ol></li><li class="chapter-item expanded "><a href="ERRORS.html"><strong aria-hidden="true">7.</strong> Error Handling</a></li><li><ol class="section"><li class="chapter-item expanded "><div><strong aria-hidden="true">7.1.</strong> Errors as monads</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">7.2.</strong> Errors as checked exceptions</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">7.3.</strong> Errors as effects [todo]</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">7.4.</strong> Unrecoverable Exceptions</div></li></ol></li><li class="chapter-item expanded "><a href="ASYNC.html"><strong aria-hidden="true">8.</strong> Async System</a></li><li><ol class="section"><li class="chapter-item expanded "><div><strong aria-hidden="true">8.1.</strong> Effects System [todo]</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">8.2.</strong> Threading [todo]</div></li></ol></li><li class="chapter-item expanded "><a href="INTEROP.html"><strong aria-hidden="true">9.</strong> Language Interop [draft]</a></li><li><ol class="section"><li class="chapter-item expanded "><div><strong aria-hidden="true">9.1.</strong> Rust</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">9.2.</strong> Swift, Nim</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">9.3.</strong> Java, Kotlin</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">9.4.</strong> Python, Racket, C</div></li></ol></li><li class="chapter-item expanded "><div><strong aria-hidden="true">10.</strong> Effects System [draft]</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">11.</strong> Refinement Types [draft]</div></li><li class="chapter-item expanded "><div><strong aria-hidden="true">12.</strong> Dependent Types [draft]</div></li><li class="chapter-item expanded "><a href="EXAMPLES.html"><strong aria-hidden="true">13.</strong> Examples</a></li></ol>
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@@ -178,7 +178,7 @@
 <p>! This section is <strong>incomplete</strong>. Proceed with caution.</p>
 </blockquote>
 <p>Puck has a first-class module system, inspired by such expressive designs in the ML family.</p>
-<h2 id="what-are-modules"><a class="header" href="#what-are-modules">What are Modules?</a></h2>
+<h2 id="what-are-modules"><a class="header" href="#what-are-modules">What are modules?</a></h2>
 <pre><code class="language-puck">pub mod stack =
   pub type Stack[T] = class
     init(static type Self): Stack[T]
@@ -219,7 +219,7 @@ use lib.crypto, lib.http
 <p>The <code>this</code> and <code>pkg</code> modules are useful for this implicit structure...</p>
 <h2 id="defining-interfaces"><a class="header" href="#defining-interfaces">Defining interfaces</a></h2>
 <p>...</p>
-<h2 id="defining-an-external-api"><a class="header" href="#defining-an-external-api">Defining an External API</a></h2>
+<h2 id="defining-an-external-api"><a class="header" href="#defining-an-external-api">Defining an external API</a></h2>
 <p>The filesystem provides an implicit module structure, but it may not be the one you want to expose to users.</p>
 <p>...</p>
 
@@ -231,7 +231,7 @@ use lib.crypto, lib.http
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@@ -245,7 +245,7 @@ use lib.crypto, lib.http
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