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-rw-r--r--src/etc/htmldocck.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/etc/htmldocck.py b/src/etc/htmldocck.py
index 25734217589..ad78e13ca25 100644
--- a/src/etc/htmldocck.py
+++ b/src/etc/htmldocck.py
@@ -176,6 +176,9 @@ def concat_multi_lines(f):
             firstlineno = None
             catenated = ''
 
+    if lastline is not None:
+        raise RuntimeError('Trailing backslash in the end of file')
+
 LINE_PATTERN = re.compile(r'''
     (?<=(?<!\S)@)(?P<negated>!?)
     (?P<cmd>[A-Za-z]+(?:-[A-Za-z]+)*)