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@@ -642,12 +642,12 @@ indented more than the currently enclosing layout block. Blocks with a single
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element can be written on the same line as the previous token.</p>
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<p>Each element of the block must share the same indentation and no part of an
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element may be indented less than the indentation of the block. For instance</p>
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<div class="highlight"><pre><span></span><code>contract Layout =
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function foo() = 0 // no layout
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function bar() = // layout block starts on next line
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let x = foo() // indented more than 2 spaces
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x
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+ 1 // the '+' is indented more than the 'x'
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<div class="highlight"><pre><span></span><code><span class="k">contract</span><span class="w"> </span><span class="nf">Layout</span><span class="w"> </span><span class="ow">=</span><span class="w"></span>
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<span class="w"> </span><span class="k">function</span><span class="w"> </span><span class="n">foo</span><span class="p">()</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="c1">// no layout</span>
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<span class="w"> </span><span class="k">function</span><span class="w"> </span><span class="n">bar</span><span class="p">()</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="c1">// layout block starts on next line</span>
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<span class="w"> </span><span class="k">let</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="n">foo</span><span class="p">()</span><span class="w"> </span><span class="c1">// indented more than 2 spaces</span>
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<span class="w"> </span><span class="n">x</span><span class="w"></span>
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<span class="w"> </span><span class="ow">+</span><span class="w"> </span><span class="mi">1</span><span class="w"> </span><span class="c1">// the '+' is indented more than the 'x'</span>
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</code></pre></div>
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<h2 id="notation">Notation</h2>
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<p>In describing the syntax below, we use the following conventions:</p>
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@@ -692,9 +692,9 @@ element may be indented less than the indentation of the block. For instance</p>
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</code></pre></div>
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<p>Contract declarations must appear at the top-level.</p>
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<p>For example,
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<div class="highlight"><pre><span></span><code>contract Test =
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type t = int
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entrypoint add (x : t, y : t) = x + y
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<div class="highlight"><pre><span></span><code><span class="k">contract</span><span class="w"> </span><span class="nf">Test</span><span class="w"> </span><span class="ow">=</span><span class="w"></span>
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<span class="w"> </span><span class="k">type</span><span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="kt">int</span><span class="w"></span>
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<span class="w"> </span><span class="k">entrypoint</span><span class="w"> </span><span class="n">add</span><span class="w"> </span><span class="p">(</span><span class="n">x</span><span class="w"> </span><span class="ow">:</span><span class="w"> </span><span class="n">t</span><span class="p">,</span><span class="w"> </span><span class="n">y</span><span class="w"> </span><span class="ow">:</span><span class="w"> </span><span class="n">t</span><span class="p">)</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="ow">+</span><span class="w"> </span><span class="n">y</span><span class="w"></span>
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</code></pre></div></p>
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<p>There are three forms of type declarations: type aliases (declared with the
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<code>type</code> keyword), record type definitions (<code>record</code>) and data type definitions
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@@ -707,9 +707,9 @@ element may be indented less than the indentation of the block. For instance</p>
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<span class="n">ConDecl</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="n">Con</span><span class="w"> </span><span class="p">[</span><span class="sc">'('</span><span class="w"> </span><span class="n">Sep1</span><span class="p">(</span><span class="n">Type</span><span class="p">,</span><span class="w"> </span><span class="sc">','</span><span class="p">)</span><span class="w"> </span><span class="sc">')'</span><span class="p">]</span><span class="w"></span>
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</code></pre></div>
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<p>For example,
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<div class="highlight"><pre><span></span><code>record point('a) = {x : 'a, y : 'a}
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datatype shape('a) = Circle(point('a), 'a) | Rect(point('a), point('a))
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type int_shape = shape(int)
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<div class="highlight"><pre><span></span><code><span class="k">record</span><span class="w"> </span><span class="n">point</span><span class="p">(</span><span class="nv">'a</span><span class="p">)</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="p">{</span><span class="n">x</span><span class="w"> </span><span class="ow">:</span><span class="w"> </span><span class="nv">'a</span><span class="p">,</span><span class="w"> </span><span class="n">y</span><span class="w"> </span><span class="ow">:</span><span class="w"> </span><span class="nv">'a</span><span class="p">}</span><span class="w"></span>
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<span class="k">datatype</span><span class="w"> </span><span class="n">shape</span><span class="p">(</span><span class="nv">'a</span><span class="p">)</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="nf">Circle</span><span class="p">(</span><span class="n">point</span><span class="p">(</span><span class="nv">'a</span><span class="p">),</span><span class="w"> </span><span class="nv">'a</span><span class="p">)</span><span class="w"> </span><span class="ow">|</span><span class="w"> </span><span class="nf">Rect</span><span class="p">(</span><span class="n">point</span><span class="p">(</span><span class="nv">'a</span><span class="p">),</span><span class="w"> </span><span class="n">point</span><span class="p">(</span><span class="nv">'a</span><span class="p">))</span><span class="w"></span>
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<span class="k">type</span><span class="w"> </span><span class="n">int_shape</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="n">shape</span><span class="p">(</span><span class="kt">int</span><span class="p">)</span><span class="w"></span>
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</code></pre></div></p>
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<h2 id="types">Types</h2>
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<div class="highlight"><pre><span></span><code><span class="n">Type</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="n">Domain</span><span class="w"> </span><span class="err">'</span><span class="o">=></span><span class="err">'</span><span class="w"> </span><span class="n">Type</span><span class="w"> </span><span class="c1">// Function type</span>
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@@ -723,7 +723,7 @@ type int_shape = shape(int)
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</code></pre></div>
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<p>The function type arrow associates to the right.</p>
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<p>Example,
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<div class="highlight"><pre><span></span><code>'a => list('a) => (int * list('a))
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<div class="highlight"><pre><span></span><code><span class="nv">'a</span><span class="w"> </span><span class="ow">=></span><span class="w"> </span><span class="kt">list</span><span class="p">(</span><span class="nv">'a</span><span class="p">)</span><span class="w"> </span><span class="ow">=></span><span class="w"> </span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="ow">*</span><span class="w"> </span><span class="kt">list</span><span class="p">(</span><span class="nv">'a</span><span class="p">))</span><span class="w"></span>
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</code></pre></div></p>
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<h2 id="statements">Statements</h2>
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<p>Function bodies are blocks of <em>statements</em>, where a statement is one of the following</p>
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@@ -741,16 +741,16 @@ type int_shape = shape(int)
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<span class="n">Pattern</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="n">Expr</span><span class="w"></span>
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</code></pre></div>
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<p><code>if</code> statements can be followed by zero or more <code>elif</code> statements and an optional final <code>else</code> statement. For example,</p>
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<div class="highlight"><pre><span></span><code>let x : int = 4
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switch(f(x))
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None => 0
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Some(y) =>
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if(y > 10)
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"too big"
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elif(y < 3)
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"too small"
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else
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"just right"
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<div class="highlight"><pre><span></span><code><span class="k">let</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="ow">:</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="ow">=</span><span class="w"> </span><span class="mi">4</span><span class="w"></span>
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<span class="k">switch</span><span class="p">(</span><span class="n">f</span><span class="p">(</span><span class="n">x</span><span class="p">))</span><span class="w"></span>
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<span class="w"> </span><span class="nf">None</span><span class="w"> </span><span class="ow">=></span><span class="w"> </span><span class="mi">0</span><span class="w"></span>
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<span class="w"> </span><span class="nf">Some</span><span class="p">(</span><span class="n">y</span><span class="p">)</span><span class="w"> </span><span class="ow">=></span><span class="w"></span>
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<span class="w"> </span><span class="k">if</span><span class="p">(</span><span class="n">y</span><span class="w"> </span><span class="ow">></span><span class="w"> </span><span class="mi">10</span><span class="p">)</span><span class="w"></span>
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<span class="w"> </span><span class="s2">"too big"</span><span class="w"></span>
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<span class="w"> </span><span class="k">elif</span><span class="p">(</span><span class="n">y</span><span class="w"> </span><span class="ow"><</span><span class="w"> </span><span class="mi">3</span><span class="p">)</span><span class="w"></span>
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<span class="w"> </span><span class="s2">"too small"</span><span class="w"></span>
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<span class="w"> </span><span class="k">else</span><span class="w"></span>
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<span class="w"> </span><span class="s2">"just right"</span><span class="w"></span>
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</code></pre></div>
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<h2 id="expressions">Expressions</h2>
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<div class="highlight"><pre><span></span><code><span class="n">Expr</span><span class="w"> </span><span class="o">::=</span><span class="w"> </span><span class="sc">'('</span><span class="w"> </span><span class="n">LamArgs</span><span class="w"> </span><span class="sc">')'</span><span class="w"> </span><span class="err">'</span><span class="o">=></span><span class="err">'</span><span class="w"> </span><span class="n">Block</span><span class="p">(</span><span class="n">Stmt</span><span class="p">)</span><span class="w"> </span><span class="c1">// Anonymous function (x) => x + 1</span>
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