Handle break-to-labeled-non-loop

Closes #1

acorn.js

@@ -970,8 +970,10 @@
       // continue to.
       for (var i = 0; i < labels.length; ++i) {
         var lab = labels[i];
-        if ((node.label == null || lab.name === node.label.name) &&
+        if (node.label == null || lab.name === node.label.name) {
-            lab.kind != null && (isBreak || lab.kind === "loop")) break;
+          if (lab.kind != null && (isBreak || lab.kind === "loop")) break;
+          if (node.label && isBreak) break;
+        }
       }
       if (i === labels.length) raise(node.start, "Unsyntactic " + starttype.keyword);
       return finishNode(node, isBreak ? "BreakStatement" : "ContinueStatement");

index.html

@@ -660,8 +660,10 @@ complexity.</p>             </td>             <td class="code">               <d
       <span class="p">}</span></pre></div>             </td>           </tr>                               <tr id="section-89">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-89">&#182;</a>               </div>               <p>Verify that there is an actual destination to break or
 continue to.</p>             </td>             <td class="code">               <div class="highlight"><pre>      <span class="k">for</span> <span class="p">(</span><span class="kd">var</span> <span class="nx">i</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="nx">i</span> <span class="o">&lt;</span> <span class="nx">labels</span><span class="p">.</span><span class="nx">length</span><span class="p">;</span> <span class="o">++</span><span class="nx">i</span><span class="p">)</span> <span class="p">{</span>
         <span class="kd">var</span> <span class="nx">lab</span> <span class="o">=</span> <span class="nx">labels</span><span class="p">[</span><span class="nx">i</span><span class="p">];</span>
-        <span class="k">if</span> <span class="p">((</span><span class="nx">node</span><span class="p">.</span><span class="nx">label</span> <span class="o">==</span> <span class="kc">null</span> <span class="o">||</span> <span class="nx">lab</span><span class="p">.</span><span class="nx">name</span> <span class="o">===</span> <span class="nx">node</span><span class="p">.</span><span class="nx">label</span><span class="p">.</span><span class="nx">name</span><span class="p">)</span> <span class="o">&amp;&amp;</span>
+        <span class="k">if</span> <span class="p">(</span><span class="nx">node</span><span class="p">.</span><span class="nx">label</span> <span class="o">==</span> <span class="kc">null</span> <span class="o">||</span> <span class="nx">lab</span><span class="p">.</span><span class="nx">name</span> <span class="o">===</span> <span class="nx">node</span><span class="p">.</span><span class="nx">label</span><span class="p">.</span><span class="nx">name</span><span class="p">)</span> <span class="p">{</span>
-            <span class="nx">lab</span><span class="p">.</span><span class="nx">kind</span> <span class="o">!=</span> <span class="kc">null</span> <span class="o">&amp;&amp;</span> <span class="p">(</span><span class="nx">isBreak</span> <span class="o">||</span> <span class="nx">lab</span><span class="p">.</span><span class="nx">kind</span> <span class="o">===</span> <span class="s2">&quot;loop&quot;</span><span class="p">))</span> <span class="k">break</span><span class="p">;</span>
+          <span class="k">if</span> <span class="p">(</span><span class="nx">lab</span><span class="p">.</span><span class="nx">kind</span> <span class="o">!=</span> <span class="kc">null</span> <span class="o">&amp;&amp;</span> <span class="p">(</span><span class="nx">isBreak</span> <span class="o">||</span> <span class="nx">lab</span><span class="p">.</span><span class="nx">kind</span> <span class="o">===</span> <span class="s2">&quot;loop&quot;</span><span class="p">))</span> <span class="k">break</span><span class="p">;</span>
+          <span class="k">if</span> <span class="p">(</span><span class="nx">node</span><span class="p">.</span><span class="nx">label</span> <span class="o">&amp;&amp;</span> <span class="nx">isBreak</span><span class="p">)</span> <span class="k">break</span><span class="p">;</span>
+        <span class="p">}</span>
       <span class="p">}</span>
       <span class="k">if</span> <span class="p">(</span><span class="nx">i</span> <span class="o">===</span> <span class="nx">labels</span><span class="p">.</span><span class="nx">length</span><span class="p">)</span> <span class="nx">raise</span><span class="p">(</span><span class="nx">node</span><span class="p">.</span><span class="nx">start</span><span class="p">,</span> <span class="s2">&quot;Unsyntactic &quot;</span> <span class="o">+</span> <span class="nx">starttype</span><span class="p">.</span><span class="nx">keyword</span><span class="p">);</span>
       <span class="k">return</span> <span class="nx">finishNode</span><span class="p">(</span><span class="nx">node</span><span class="p">,</span> <span class="nx">isBreak</span> <span class="o">?</span> <span class="s2">&quot;BreakStatement&quot;</span> <span class="o">:</span> <span class="s2">&quot;ContinueStatement&quot;</span><span class="p">);</span>

test/tests.js

@@ -25724,6 +25724,118 @@ test("", {
   }
 });
 
+test("foo: if (true) break foo;", {
+  type: "Program",
+  start: 0,
+  end: 25,
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 25
+    }
+  },
+  body: [
+    {
+      type: "LabeledStatement",
+      start: 0,
+      end: 25,
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 25
+        }
+      },
+      body: {
+        type: "IfStatement",
+        start: 5,
+        end: 25,
+        loc: {
+          start: {
+            line: 1,
+            column: 5
+          },
+          end: {
+            line: 1,
+            column: 25
+          }
+        },
+        test: {
+          type: "Literal",
+          start: 9,
+          end: 13,
+          loc: {
+            start: {
+              line: 1,
+              column: 9
+            },
+            end: {
+              line: 1,
+              column: 13
+            }
+          },
+          value: true
+        },
+        consequent: {
+          type: "BreakStatement",
+          start: 15,
+          end: 25,
+          loc: {
+            start: {
+              line: 1,
+              column: 15
+            },
+            end: {
+              line: 1,
+              column: 25
+            }
+          },
+          label: {
+            type: "Identifier",
+            start: 21,
+            end: 24,
+            loc: {
+              start: {
+                line: 1,
+                column: 21
+              },
+              end: {
+                line: 1,
+                column: 24
+              }
+            },
+            name: "foo"
+          }
+        },
+        alternate: null
+      },
+      label: {
+        type: "Identifier",
+        start: 0,
+        end: 3,
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 3
+          }
+        },
+        name: "foo"
+      }
+    }
+  ]
+});
+
 // Failure tests
 
 testFail("{",