role nodes should not inherit from Body

This causes them to be ignored in inline parsing mode.

Author: i80and

snooty/gizaparser/test_steps.py

@@ -52,8 +52,9 @@ def create_page() -> Tuple[Page, EmbeddedRstParser]:
         '</target></paragraph></section></directive>',
 
         '<directive name="step"><section><heading><text>Create a </text><literal><text>',
-        '/etc/apt/sources.list.d/mongodb-org-3.4.list</text></literal><text> file for MongoDB.',
-        '</text></heading>',
+        '/etc/apt/sources.list.d/mongodb-org-3.4.list</text></literal><text> file for </text>',
+        '<role name="guilabel" label="MongoDB" target="MongoDB" raw="MongoDB"></role>',
+        '<text>.</text></heading>',
         '<section><heading><text>Optional: action heading</text></heading>'
         '<paragraph><text>Create the list file using the command appropriate for ',
         'your version\nof Debian.</text></paragraph>',

snooty/rstparser.py

@@ -55,7 +55,7 @@ class code(docutils.nodes.General, docutils.nodes.FixedTextElement):
     pass
 
 
-class role(docutils.nodes.General, docutils.nodes.Inline, docutils.nodes.Element):
+class role(docutils.nodes.Inline, docutils.nodes.Element):
     def __init__(self, name: str, rawtext: str, text: str, lineno: int) -> None:
         super(role, self).__init__()
         self['name'] = name

test_data/steps-test.yaml

@@ -4,7 +4,7 @@ source:
   file: steps-test-child.yaml
   ref: import-key
 ---
-title: Create a ``/etc/apt/sources.list.d/mongodb-org-{+version+}.list`` file for MongoDB.
+title: Create a ``/etc/apt/sources.list.d/mongodb-org-{+version+}.list`` file for :guilabel:`MongoDB`.
 stepnum: 2
 level: 4
 ref: sources-list