From c6050a3d1ec4f7245ea51e26062130884f31641f Mon Sep 17 00:00:00 2001
From: Takeshi KOMIYA <i.tkomiya@gmail.com>
Date: Tue, 15 May 2018 01:46:40 +0900
Subject: [PATCH] Fix latex: deeply nested enumerated list which is beginning
 with non-1 causes LaTeX engine crashed

---
 CHANGES                                           | 2 ++
 sphinx/writers/latex.py                           | 5 +++--
 tests/roots/test-nested-enumerated-list/index.rst | 6 ++++++
 tests/test_build_latex.py                         | 1 +
 4 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/CHANGES b/CHANGES
index 126d414a5..e1773b6a6 100644
--- a/CHANGES
+++ b/CHANGES
@@ -23,6 +23,8 @@ Bugs fixed
   topic, admonition, table and section.
 * #4913: i18n: literal blocks in bullet list are not translated
 * #4962: cpp domain: raises TypeError on duplicate declaration
+* latex: deeply nested enumerated list which is beginning with non-1 causes
+  LaTeX engine crashed
 
 Testing
 --------
diff --git a/sphinx/writers/latex.py b/sphinx/writers/latex.py
index 17eabc462..d4deb49ac 100644
--- a/sphinx/writers/latex.py
+++ b/sphinx/writers/latex.py
@@ -18,6 +18,7 @@ from collections import defaultdict
 from os import path
 
 from docutils import nodes, writers
+from docutils.utils.roman import toRoman
 from docutils.writers.latex2e import Babel
 from six import itervalues, text_type
 
@@ -1514,8 +1515,8 @@ class LaTeXTranslator(nodes.NodeVisitor):
 
         self.body.append('\\begin{enumerate}\n')
         if 'start' in node:
-            nested = get_nested_level(node)
-            self.body.append('\\setcounter{enum%s}{%d}\n' % ('i' * nested, node['start'] - 1))
+            enum_depth = "enum%s" % toRoman(get_nested_level(node)).lower()
+            self.body.append('\\setcounter{%s}{%d}\n' % (enum_depth, node['start'] - 1))
         if self.table:
             self.table.has_problematic = True
 
diff --git a/tests/roots/test-nested-enumerated-list/index.rst b/tests/roots/test-nested-enumerated-list/index.rst
index e1a9b5cbc..28ad72f9d 100644
--- a/tests/roots/test-nested-enumerated-list/index.rst
+++ b/tests/roots/test-nested-enumerated-list/index.rst
@@ -9,6 +9,12 @@ nested-enumerated-list
       10) Pyramid
       11) Nile River
 
+          (x) Atbara
+          (y) Blue Nile
+          (#) Sobat
+          (#) Semliki
+          (#) Kagera
+
 6. Markup
 
    iii. reStructuredText
diff --git a/tests/test_build_latex.py b/tests/test_build_latex.py
index c6aed1e3e..75515cf64 100644
--- a/tests/test_build_latex.py
+++ b/tests/test_build_latex.py
@@ -1239,4 +1239,5 @@ def test_latex_nested_enumerated_list(app, status, warning):
     assert r'\setcounter{enumi}{4}' in result
     assert r'\setcounter{enumii}{3}' in result
     assert r'\setcounter{enumiii}{9}' in result
+    assert r'\setcounter{enumiv}{23}' in result
     assert r'\setcounter{enumii}{2}' in result