Fix non-paragraph as single child in list-items

Closes remarkjs/remark#270.

Author: wooorm

lib/handlers/list-item.js

@@ -10,10 +10,16 @@ var all = require('../all');
 function listItem(h, node, parent) {
   var children = node.children;
   var head = children[0];
-  var single = (!parent || !parent.loose) && head && head.children && children.length === 1;
-  var result = all(h, single ? head : node);
-  var container;
   var props = {};
+  var single = false;
+  var result;
+  var container;
+
+  if ((!parent || !parent.loose) && children.length === 1 && head.type === 'paragraph') {
+    single = true;
+  }
+
+  result = all(h, single ? head : node);
 
   if (typeof node.checked === 'boolean') {
     if (!single && (!head || head.type !== 'paragraph')) {

test/list-item.js

@@ -128,5 +128,29 @@ test('ListItem', function (t) {
     'should support checkboxes in `listItem`s without children'
   );
 
+  t.deepEqual(
+    to(u('listItem', [
+      u('list', {ordered: false}, [
+        u('listItem', [
+          u('paragraph', [
+            u('text', 'Alpha')
+          ])
+        ])
+      ])
+    ])),
+    u('element', {tagName: 'li', properties: {}}, [
+      u('text', '\n'),
+      u('element', {tagName: 'ul', properties: {}}, [
+        u('text', '\n'),
+        u('element', {tagName: 'li', properties: {}}, [
+          u('text', 'Alpha')
+        ]),
+        u('text', '\n')
+      ]),
+      u('text', '\n')
+    ]),
+    'should support lists in `listItem`s'
+  );
+
   t.end();
 });