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Taken from http://hg.sharesource.org/asciidoc/raw-rev/8b6d11203ed3

# HG changeset patch
# User Stuart Rackham <srackham@methods.co.nz>
# Date 1197344594 -46800
# Node ID 8b6d11203ed3729ed597fc7ca876bde205d271a1
# Parent 386e75a49a1ae3437581fae97a5d5c27c82ba5fb
b variable used before assignment

An error is generated using the asciidoc -e option when
there are no block definitions.

Patch submitted by Alejandro Mery

--- a/asciidoc.py	Tue Dec 11 11:10:45 2007 +1300
+++ b/asciidoc.py	Tue Dec 11 16:43:14 2007 +1300
@@ -2061,16 +2061,13 @@ class AbstractBlocks:
     def validate(self):
         '''Validate the block definitions.'''
         # Validate delimiters and build combined lists delimiter pattern.
+        delimiters = []
         for b in self.blocks:
             assert b.__class__ is self.BLOCK_TYPE
             b.validate()
-        if b.is_conf_entry('delimiter'):
-            delimiters = []
-            for b in self.blocks:
-                b.validate()
-                if b.delimiter:
-                    delimiters.append(b.delimiter)
-            self.delimiter = join_regexp(delimiters)
+            if b.delimiter:
+                delimiters.append(b.delimiter)
+        self.delimiter = join_regexp(delimiters)
 
 class Paragraph(AbstractBlock):
     def __init__(self):