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-rw-r--r--sphinx/pycode/__init__.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/sphinx/pycode/__init__.py b/sphinx/pycode/__init__.py
index 1187b6a4..fa8d0e94 100644
--- a/sphinx/pycode/__init__.py
+++ b/sphinx/pycode/__init__.py
@@ -234,6 +234,8 @@ class ModuleAnalyzer(object):
attr_visitor = AttrDocVisitor(number2name, scope, self.encoding)
attr_visitor.visit(self.parsetree)
self.attr_docs = attr_visitor.collected
+ # now that we found everything we could in the tree, throw it away
+ # (it takes quite a bit of memory for large modules)
self.parsetree = None
return attr_visitor.collected