Fix annotations (minor fixes)

23 files changed, 88 insertions, 76 deletions

diff --git a/sphinx/addnodes.py b/sphinx/addnodes.py
index cdef72cbf..bf6ff12b9 100644
--- a/sphinx/addnodes.py
+++ b/sphinx/addnodes.py
@@ -107,6 +107,7 @@ class desc_signature_line(nodes.Part, nodes.Inline, nodes.FixedTextElement):
     It should only be used in a ``desc_signature`` with ``is_multiline`` set.
     Set ``add_permalink = True`` for the line that should get the permalink.
     """
+    sphinx_cpp_tagname = ''
 
 
 # nodes to use within a desc_signature or desc_signature_line
diff --git a/sphinx/builders/_epub_base.py b/sphinx/builders/_epub_base.py
index ad8097dba..1bfbad514 100644
--- a/sphinx/builders/_epub_base.py
+++ b/sphinx/builders/_epub_base.py
@@ -317,7 +317,7 @@ class EpubBuilder(StandaloneHTMLBuilder):
             return footnote
 
         def footnote_spot(tree):
-            # type: (nodes.document) -> Tuple[nodes.document, int]
+            # type: (nodes.document) -> Tuple[nodes.Element, int]
             """Find or create a spot to place footnotes.
 
             The function returns the tuple (parent, index)."""
diff --git a/sphinx/builders/gettext.py b/sphinx/builders/gettext.py
index a8fcca5ac..fd72437b0 100644
--- a/sphinx/builders/gettext.py
+++ b/sphinx/builders/gettext.py
@@ -144,9 +144,8 @@ class I18nBuilder(Builder):
         return
 
     def write_doc(self, docname, doctree):
-        # type: (unicode, nodes.Node) -> None
-        catalog = self.catalogs[find_catalog(docname,
-                                             self.config.gettext_compact)]
+        # type: (unicode, nodes.document) -> None
+        catalog = self.catalogs[find_catalog(docname, self.config.gettext_compact)]
 
         for node, msg in extract_messages(doctree):
             catalog.add(msg, node)
diff --git a/sphinx/builders/manpage.py b/sphinx/builders/manpage.py
index a18d77d82..e5e9e187d 100644
--- a/sphinx/builders/manpage.py
+++ b/sphinx/builders/manpage.py
@@ -84,6 +84,11 @@ class ManualPageBuilder(Builder):
                 else:
                     authors = []
 
+            docsettings.title = name
+            docsettings.subtitle = description
+            docsettings.authors = authors
+            docsettings.section = section
+
             targetname = '%s.%s' % (name, section)
             logger.info(darkgreen(targetname) + ' { ', nonl=True)
             destination = FileOutput(
@@ -94,18 +99,13 @@ class ManualPageBuilder(Builder):
             docnames = set()  # type: Set[unicode]
             largetree = inline_all_toctrees(self, docnames, docname, tree,
                                             darkgreen, [docname])
+            largetree.settings = docsettings
             logger.info('} ', nonl=True)
             self.env.resolve_references(largetree, docname, self)
             # remove pending_xref nodes
             for pendingnode in largetree.traverse(addnodes.pending_xref):
                 pendingnode.replace_self(pendingnode.children)
 
-            largetree.settings = docsettings
-            largetree.settings.title = name
-            largetree.settings.subtitle = description
-            largetree.settings.authors = authors
-            largetree.settings.section = section
-
             docwriter.write(largetree, destination)
         logger.info('')
 
diff --git a/sphinx/directives/patches.py b/sphinx/directives/patches.py
index db59b6968..e4088af07 100644
--- a/sphinx/directives/patches.py
+++ b/sphinx/directives/patches.py
@@ -129,7 +129,7 @@ class MathDirective(SphinxDirective):
         if self.arguments and self.arguments[0]:
             latex = self.arguments[0] + '\n\n' + latex
         node = nodes.math_block(latex, latex,
-                                docname=self.state.document.settings.env.docname,
+                                docname=self.env.docname,
                                 number=self.options.get('name'),
                                 label=self.options.get('label'),
                                 nowrap='nowrap' in self.options)
diff --git a/sphinx/domains/cpp.py b/sphinx/domains/cpp.py
index 2f8d126a4..fa85eada5 100644
--- a/sphinx/domains/cpp.py
+++ b/sphinx/domains/cpp.py
@@ -2145,7 +2145,7 @@ class ASTNestedName(ASTBase):
             # else append directly to signode.
             # NOTE: Breathe relies on the prefix being in the desc_addname node,
             #       so it can remove it in inner declarations.
-            dest = signode
+            dest = signode  # type: nodes.Element
             if mode == 'lastIsName':
                 dest = addnodes.desc_addname()
             for i in range(len(names)):
diff --git a/sphinx/domains/std.py b/sphinx/domains/std.py
index 28177d6ee..bf17e7315 100644
--- a/sphinx/domains/std.py
+++ b/sphinx/domains/std.py
@@ -129,7 +129,7 @@ class Target(SphinxDirective):
         targetname = '%s-%s' % (self.name, fullname)
         node = nodes.target('', '', ids=[targetname])
         self.state.document.note_explicit_target(node)
-        ret = [node]
+        ret = [node]  # type: List[nodes.Node]
         if self.indextemplate:
             indexentry = self.indextemplate % (fullname,)
             indextype = 'single'
@@ -303,7 +303,7 @@ class Glossary(SphinxDirective):
         entries = []  # type: List[Tuple[List[Tuple[unicode, unicode, int]], StringList]]
         in_definition = True
         was_empty = True
-        messages = []
+        messages = []  # type: List[nodes.Node]
         for line, (source, lineno) in zip(self.content, self.content.items):
             # empty line -> add to last definition
             if not line:
diff --git a/sphinx/environment/__init__.py b/sphinx/environment/__init__.py
index 4d227058a..c987be3db 100644
--- a/sphinx/environment/__init__.py
+++ b/sphinx/environment/__init__.py
@@ -555,7 +555,7 @@ class BuildEnvironment:
 
     def get_and_resolve_doctree(self, docname, builder, doctree=None,
                                 prune_toctrees=True, includehidden=False):
-        # type: (unicode, Builder, nodes.Node, bool, bool) -> nodes.document
+        # type: (unicode, Builder, nodes.document, bool, bool) -> nodes.document
         """Read the doctree from the pickle, resolve cross-references and
         toctrees and return it.
         """
@@ -600,7 +600,7 @@ class BuildEnvironment:
         self.apply_post_transforms(doctree, fromdocname)
 
     def apply_post_transforms(self, doctree, docname):
-        # type: (nodes.Node, unicode) -> None
+        # type: (nodes.document, unicode) -> None
         """Apply all post-transforms."""
         try:
             # set env.docname during applying post-transforms
@@ -700,7 +700,7 @@ class BuildEnvironment:
         self.app.builder.read_doc(docname)
 
     def write_doctree(self, docname, doctree):
-        # type: (unicode, nodes.Node) -> None
+        # type: (unicode, nodes.document) -> None
         warnings.warn('env.write_doctree() is deprecated. '
                       'Please use builder.write_doctree() instead.',
                       RemovedInSphinx30Warning, stacklevel=2)
@@ -759,7 +759,7 @@ class BuildEnvironment:
 
     @classmethod
     def dumps(cls, env):
-        # type: (BuildEnvironment) -> unicode
+        # type: (BuildEnvironment) -> bytes
         warnings.warn('BuildEnvironment.dumps() is deprecated. '
                       'Please use pickle.dumps() instead.',
                       RemovedInSphinx30Warning, stacklevel=2)
@@ -784,7 +784,7 @@ class BuildEnvironment:
         return self.domaindata['changeset']['changes']
 
     def note_versionchange(self, type, version, node, lineno):
-        # type: (unicode, unicode, nodes.Node, int) -> None
+        # type: (unicode, unicode, addnodes.versionmodified, int) -> None
         warnings.warn('env.note_versionchange() is deprecated. '
                       'Please use ChangeSetDomain.note_changeset() instead.',
                       RemovedInSphinx30Warning, stacklevel=2)
diff --git a/sphinx/ext/autosectionlabel.py b/sphinx/ext/autosectionlabel.py
index 4c601b497..db4185331 100644
--- a/sphinx/ext/autosectionlabel.py
+++ b/sphinx/ext/autosectionlabel.py
@@ -40,12 +40,12 @@ def register_sections_as_label(app, document):
         labelid = node['ids'][0]
         docname = app.env.docname
         title = cast(nodes.title, node[0])
-        ref_name = getattr(node[0], 'rawsource', title.astext())
+        ref_name = getattr(title, 'rawsource', title.astext())
         if app.config.autosectionlabel_prefix_document:
             name = nodes.fully_normalize_name(docname + ':' + ref_name)
         else:
             name = nodes.fully_normalize_name(ref_name)
-        sectname = clean_astext(node[0])
+        sectname = clean_astext(title)
 
         if name in labels:
             logger.warning(__('duplicate label %s, other instance in %s'),
diff --git a/sphinx/ext/autosummary/__init__.py b/sphinx/ext/autosummary/__init__.py
index b2c1db5b3..1810b4de7 100644
--- a/sphinx/ext/autosummary/__init__.py
+++ b/sphinx/ext/autosummary/__init__.py
@@ -83,7 +83,7 @@ from sphinx.util.matching import Matcher
 
 if False:
     # For type annotation
-    from typing import Any, Dict, Tuple, Type, Union  # NOQA
+    from typing import Any, Dict, Tuple, Type  # NOQA
     from docutils.parsers.rst.states import Inliner  # NOQA
     from sphinx.application import Sphinx  # NOQA
     from sphinx.environment import BuildEnvironment  # NOQA
@@ -274,8 +274,7 @@ class Autosummary(SphinxDirective):
             tocnode['maxdepth'] = -1
             tocnode['glob'] = None
 
-            tocnode = autosummary_toc('', '', tocnode)
-            nodes.append(tocnode)
+            nodes.append(autosummary_toc('', '', tocnode))
 
         return self.warnings + nodes
 
@@ -354,7 +353,7 @@ class Autosummary(SphinxDirective):
         return items
 
     def get_table(self, items):
-        # type: (List[Tuple[unicode, unicode, unicode, unicode]]) -> List[Union[addnodes.tabular_col_spec, autosummary_table]]  # NOQA
+        # type: (List[Tuple[unicode, unicode, unicode, unicode]]) -> List[nodes.Node]
         """Generate a proper list of table nodes for autosummary:: directive.
 
         *items* is a list produced by :meth:`get_items`.
diff --git a/sphinx/ext/imgmath.py b/sphinx/ext/imgmath.py
index d708c1fa4..4ed831b64 100644
--- a/sphinx/ext/imgmath.py
+++ b/sphinx/ext/imgmath.py
@@ -46,7 +46,7 @@ class MathExtError(SphinxError):
     category = 'Math extension error'
 
     def __init__(self, msg, stderr=None, stdout=None):
-        # type: (unicode, unicode, unicode) -> None
+        # type: (unicode, bytes, bytes) -> None
         if stderr:
             msg += '\n[stderr]\n' + stderr.decode(sys_encoding, 'replace')
         if stdout:
diff --git a/sphinx/ext/linkcode.py b/sphinx/ext/linkcode.py
index 6ac37f7fe..f13ba7277 100644
--- a/sphinx/ext/linkcode.py
+++ b/sphinx/ext/linkcode.py
@@ -71,10 +71,9 @@ def doctree_read(app, doctree):
                 continue
             uris.add(uri)
 
+            inline = nodes.inline('', _('[source]'), classes=['viewcode-link'])
             onlynode = addnodes.only(expr='html')
-            onlynode += nodes.reference('', '', internal=False, refuri=uri)
-            onlynode[0] += nodes.inline('', _('[source]'),
-                                        classes=['viewcode-link'])
+            onlynode += nodes.reference('', '', inline, internal=False, refuri=uri)
             signode += onlynode
 
 
diff --git a/sphinx/ext/mathbase.py b/sphinx/ext/mathbase.py
index 3806b86ba..341f07486 100644
--- a/sphinx/ext/mathbase.py
+++ b/sphinx/ext/mathbase.py
@@ -63,7 +63,7 @@ def wrap_displaymath(text, label, numbering):
 
 
 def is_in_section_title(node):
-    # type: (nodes.Node) -> bool
+    # type: (nodes.Element) -> bool
     """Determine whether the node is in a section title"""
     from sphinx.util.nodes import traverse_parent
 
diff --git a/sphinx/ext/todo.py b/sphinx/ext/todo.py
index 5355ca549..00ff00a26 100644
--- a/sphinx/ext/todo.py
+++ b/sphinx/ext/todo.py
@@ -126,7 +126,7 @@ class TodoList(SphinxDirective):
     option_spec = {}  # type: Dict
 
     def run(self):
-        # type: () -> List[todolist]
+        # type: () -> List[nodes.Node]
         # Simply insert an empty todolist node which will be replaced later
         # when process_todo_nodes is called
         return [todolist('')]
diff --git a/sphinx/ext/viewcode.py b/sphinx/ext/viewcode.py
index 65a0c46f9..ec75c2166 100644
--- a/sphinx/ext/viewcode.py
+++ b/sphinx/ext/viewcode.py
@@ -121,13 +121,11 @@ def doctree_read(app, doctree):
                 continue
             names.add(fullname)
             pagename = '_modules/' + modname.replace('.', '/')
+            inline = nodes.inline('', _('[source]'), classes=['viewcode-link'])
             onlynode = addnodes.only(expr='html')
-            onlynode += addnodes.pending_xref(
-                '', reftype='viewcode', refdomain='std', refexplicit=False,
-                reftarget=pagename, refid=fullname,
-                refdoc=env.docname)
-            onlynode[0] += nodes.inline('', _('[source]'),
-                                        classes=['viewcode-link'])
+            onlynode += addnodes.pending_xref('', inline, reftype='viewcode', refdomain='std',
+                                              refexplicit=False, reftarget=pagename,
+                                              refid=fullname, refdoc=env.docname)
             signode += onlynode
 
 
diff --git a/sphinx/testing/path.py b/sphinx/testing/path.py
index 20430ff23..34cdee927 100644
--- a/sphinx/testing/path.py
+++ b/sphinx/testing/path.py
@@ -14,6 +14,7 @@ from six import text_type
 
 if False:
     # For type annotation
+    import builtins  # NOQA
     from typing import Any, Callable, IO, List  # NOQA
     from sphinx.util.typing import unicode  # NOQA
 
@@ -166,7 +167,7 @@ class path(text_type):
             return f.read()
 
     def bytes(self):
-        # type: () -> str
+        # type: () -> builtins.bytes
         """
         Returns the bytes in the file.
         """
diff --git a/sphinx/transforms/__init__.py b/sphinx/transforms/__init__.py
index bae279e86..acbd38226 100644
--- a/sphinx/transforms/__init__.py
+++ b/sphinx/transforms/__init__.py
@@ -56,7 +56,7 @@ class SphinxTransform(Transform):
     def app(self):
         # type: () -> Sphinx
         """Reference to the :class:`.Sphinx` object."""
-        return self.document.settings.env.app
+        return self.env.app
 
     @property
     def env(self):
@@ -68,7 +68,7 @@ class SphinxTransform(Transform):
     def config(self):
         # type: () -> Config
         """Reference to the :class:`.Config` object."""
-        return self.document.settings.env.config
+        return self.env.config
 
 
 class SphinxTransformer(Transformer):
diff --git a/sphinx/transforms/post_transforms/compat.py b/sphinx/transforms/post_transforms/compat.py
index 4f387449c..cc3f0ab73 100644
--- a/sphinx/transforms/post_transforms/compat.py
+++ b/sphinx/transforms/post_transforms/compat.py
@@ -58,13 +58,13 @@ class MathNodeMigrator(SphinxTransform):
             warnings.warn("Translator for %s does not support math_block node'. "
                           "Please update your extension." % translator,
                           RemovedInSphinx30Warning)
-            for math_block_node in self.document.traverse(math_block):
-                alt = displaymath(latex=math_block_node.astext(),
-                                  number=math_block_node.get('number'),
-                                  label=math_block_node.get('label'),
-                                  nowrap=math_block_node.get('nowrap'),
-                                  docname=math_block_node.get('docname'))
-                math_block_node.replace(alt)
+            for old_math_block_node in self.document.traverse(math_block):
+                alt = displaymath(latex=old_math_block_node.astext(),
+                                  number=old_math_block_node.get('number'),
+                                  label=old_math_block_node.get('label'),
+                                  nowrap=old_math_block_node.get('nowrap'),
+                                  docname=old_math_block_node.get('docname'))
+                old_math_block_node.replace_self(alt)
         elif getattr(self.app.builder, 'math_renderer_name', None) == 'unknown':
             # case: math extension provides old styled math renderer
             for math_block_node in self.document.traverse(nodes.math_block):
diff --git a/sphinx/writers/html.py b/sphinx/writers/html.py
index 4cfd9ad79..8589da2b1 100644
--- a/sphinx/writers/html.py
+++ b/sphinx/writers/html.py
@@ -14,6 +14,7 @@ import os
 import posixpath
 import sys
 import warnings
+from typing import Iterable, cast
 
 from docutils import nodes
 from docutils.writers.html4css1 import Writer, HTMLTranslator as BaseTranslator
@@ -53,17 +54,17 @@ class HTMLWriter(Writer):
     def translate(self):
         # type: () -> None
         # sadly, this is mostly copied from parent class
-        self.visitor = visitor = self.builder.create_translator(self.builder,
-                                                                self.document)
+        visitor = self.builder.create_translator(self.builder, self.document)
+        self.visitor = cast(HTMLTranslator, visitor)
         self.document.walkabout(visitor)
-        self.output = visitor.astext()
+        self.output = self.visitor.astext()
         for attr in ('head_prefix', 'stylesheet', 'head', 'body_prefix',
                      'body_pre_docinfo', 'docinfo', 'body', 'fragment',
                      'body_suffix', 'meta', 'title', 'subtitle', 'header',
                      'footer', 'html_prolog', 'html_head', 'html_title',
                      'html_subtitle', 'html_body', ):
             setattr(self, attr, getattr(visitor, attr, None))
-        self.clean_meta = ''.join(visitor.meta[2:])
+        self.clean_meta = ''.join(self.visitor.meta[2:])
 
 
 class HTMLTranslator(BaseTranslator):
@@ -252,7 +253,7 @@ class HTMLTranslator(BaseTranslator):
             if self.settings.cloak_email_addresses and \
                atts['href'].startswith('mailto:'):
                 atts['href'] = self.cloak_mailto(atts['href'])
-                self.in_mailto = 1
+                self.in_mailto = True
         else:
             assert 'refid' in node, \
                    'References must have "refuri" or "refid" attribute.'
@@ -505,11 +506,12 @@ class HTMLTranslator(BaseTranslator):
         # type: (addnodes.productionlist) -> None
         self.body.append(self.starttag(node, 'pre'))
         names = []
-        for production in node:
+        productionlist = cast(Iterable[addnodes.production], node)
+        for production in productionlist:
             names.append(production['tokenname'])
         maxlen = max(len(name) for name in names)
         lastname = None
-        for production in node:
+        for production in productionlist:
             if production['tokenname']:
                 lastname = production['tokenname'].ljust(maxlen)
                 self.body.append(self.starttag(production, 'strong', ''))
diff --git a/sphinx/writers/html5.py b/sphinx/writers/html5.py
index fcf00c7a5..6524baadc 100644
--- a/sphinx/writers/html5.py
+++ b/sphinx/writers/html5.py
@@ -13,6 +13,7 @@ import os
 import posixpath
 import sys
 import warnings
+from typing import Iterable, cast
 
 from docutils import nodes
 from docutils.writers.html5_polyglot import HTMLTranslator as BaseTranslator
@@ -451,11 +452,12 @@ class HTML5Translator(BaseTranslator):
         # type: (addnodes.productionlist) -> None
         self.body.append(self.starttag(node, 'pre'))
         names = []
-        for production in node:
+        productionlist = cast(Iterable[addnodes.production], node)
+        for production in productionlist:
             names.append(production['tokenname'])
         maxlen = max(len(name) for name in names)
         lastname = None
-        for production in node:
+        for production in productionlist:
             if production['tokenname']:
                 lastname = production['tokenname'].ljust(maxlen)
                 self.body.append(self.starttag(production, 'strong', ''))
@@ -754,7 +756,7 @@ class HTML5Translator(BaseTranslator):
         # type: (addnodes.manpage) -> None
         self.visit_literal_emphasis(node)
         if self.manpages_url:
-            node['refuri'] = self.manpages_url.format(**dict(node))
+            node['refuri'] = self.manpages_url.format(**node.attributes)
             self.visit_reference(node)
 
     def depart_manpage(self, node):
diff --git a/sphinx/writers/manpage.py b/sphinx/writers/manpage.py
index 9249266d2..850b23c3b 100644
--- a/sphinx/writers/manpage.py
+++ b/sphinx/writers/manpage.py
@@ -9,6 +9,8 @@
     :license: BSD, see LICENSE for details.
 """
 
+from typing import Iterable, cast
+
 from docutils import nodes
 from docutils.writers.manpage import (
     Writer,
@@ -41,9 +43,9 @@ class ManualPageWriter(Writer):
         transform = NestedInlineTransform(self.document)
         transform.apply()
         visitor = self.builder.create_translator(self.builder, self.document)
-        self.visitor = visitor
+        self.visitor = cast(ManualPageTranslator, visitor)
         self.document.walkabout(visitor)
-        self.output = visitor.astext()
+        self.output = self.visitor.astext()
 
 
 class NestedInlineTransform:
@@ -64,7 +66,7 @@ class NestedInlineTransform:
     def apply(self, **kwargs):
         # type: (Any) -> None
         matcher = NodeMatcher(nodes.literal, nodes.emphasis, nodes.strong)
-        for node in self.document.traverse(matcher):
+        for node in self.document.traverse(matcher):  # type: nodes.Element
             if any(matcher(subnode) for subnode in node):
                 pos = node.parent.index(node)
                 for subnode in reversed(node[1:]):
@@ -292,11 +294,12 @@ class ManualPageTranslator(BaseTranslator):
         names = []
         self.in_productionlist += 1
         self.body.append('.sp\n.nf\n')
-        for production in node:
+        productionlist = cast(Iterable[addnodes.production], node)
+        for production in productionlist:
             names.append(production['tokenname'])
         maxlen = max(len(name) for name in names)
         lastname = None
-        for production in node:
+        for production in productionlist:
             if production['tokenname']:
                 lastname = production['tokenname'].ljust(maxlen)
                 self.body.append(self.defs['strong'][0])
@@ -403,9 +406,10 @@ class ManualPageTranslator(BaseTranslator):
 
     def visit_acks(self, node):
         # type: (addnodes.acks) -> None
+        bullet_list = cast(nodes.bullet_list, node[0])
+        list_items = cast(Iterable[nodes.list_item], bullet_list)
         self.ensure_eol()
-        self.body.append(', '.join(n.astext()
-                                   for n in node.children[0].children) + '.')
+        self.body.append(', '.join(n.astext() for n in list_items) + '.')
         self.body.append('\n')
         raise nodes.SkipNode
 
diff --git a/sphinx/writers/texinfo.py b/sphinx/writers/texinfo.py
index c1857cf16..6544d742f 100644
--- a/sphinx/writers/texinfo.py
+++ b/sphinx/writers/texinfo.py
@@ -12,6 +12,7 @@
 import re
 import textwrap
 from os import path
+from typing import Iterable, cast
 
 from docutils import nodes, writers
 
@@ -135,11 +136,12 @@ class TexinfoWriter(writers.Writer):
 
     def translate(self):
         # type: () -> None
-        self.visitor = visitor = self.builder.create_translator(self.document, self.builder)
+        visitor = self.builder.create_translator(self.document, self.builder)
+        self.visitor = cast(TexinfoTranslator, visitor)
         self.document.walkabout(visitor)
-        visitor.finish()
+        self.visitor.finish()
         for attr in self.visitor_attributes:
-            setattr(self, attr, getattr(visitor, attr))
+            setattr(self, attr, getattr(self.visitor, attr))
 
 
 class TexinfoTranslator(nodes.NodeVisitor):
@@ -1431,10 +1433,11 @@ class TexinfoTranslator(nodes.NodeVisitor):
         # type: (addnodes.productionlist) -> None
         self.visit_literal_block(None)
         names = []
-        for production in node:
+        productionlist = cast(Iterable[addnodes.production], node)
+        for production in productionlist:
             names.append(production['tokenname'])
         maxlen = max(len(name) for name in names)
-        for production in node:
+        for production in productionlist:
             if production['tokenname']:
                 for id in production.get('ids'):
                     self.add_anchor(id, production)
@@ -1531,9 +1534,10 @@ class TexinfoTranslator(nodes.NodeVisitor):
 
     def visit_acks(self, node):
         # type: (addnodes.acks) -> None
+        bullet_list = cast(nodes.bullet_list, node[0])
+        list_items = cast(Iterable[nodes.list_item], bullet_list)
         self.body.append('\n\n')
-        self.body.append(', '.join(n.astext()
-                                   for n in node.children[0].children) + '.')
+        self.body.append(', '.join(n.astext() for n in list_items) + '.')
         self.body.append('\n\n')
         raise nodes.SkipNode
 
diff --git a/sphinx/writers/text.py b/sphinx/writers/text.py
index dc077e385..3e5961753 100644
--- a/sphinx/writers/text.py
+++ b/sphinx/writers/text.py
@@ -13,6 +13,7 @@ import os
 import re
 import textwrap
 from itertools import groupby, chain
+from typing import Iterable, cast
 
 from docutils import nodes, writers
 from docutils.utils import column_width
@@ -387,7 +388,7 @@ class TextWriter(writers.Writer):
         # type: () -> None
         visitor = self.builder.create_translator(self.document, self.builder)
         self.document.walkabout(visitor)
-        self.output = visitor.body
+        self.output = cast(TextTranslator, visitor).body
 
 
 class TextTranslator(nodes.NodeVisitor):
@@ -691,11 +692,12 @@ class TextTranslator(nodes.NodeVisitor):
         # type: (addnodes.productionlist) -> None
         self.new_state()
         names = []
-        for production in node:
+        productionlist = cast(Iterable[addnodes.production], node)
+        for production in productionlist:
             names.append(production['tokenname'])
         maxlen = max(len(name) for name in names)
         lastname = None
-        for production in node:
+        for production in productionlist:
             if production['tokenname']:
                 self.add_text(production['tokenname'].ljust(maxlen) + ' ::=')
                 lastname = production['tokenname']
@@ -871,9 +873,10 @@ class TextTranslator(nodes.NodeVisitor):
 
     def visit_acks(self, node):
         # type: (addnodes.acks) -> None
+        bullet_list = cast(nodes.bullet_list, node[0])
+        list_items = cast(Iterable[nodes.list_item], bullet_list)
         self.new_state(0)
-        self.add_text(', '.join(n.astext() for n in node.children[0].children) +
-                      '.')
+        self.add_text(', '.join(n.astext() for n in list_items) + '.')
         self.end_state()
         raise nodes.SkipNode