SF patch 836879.

Don't generate code for asserts in -O mode.

Lib/compiler/pycodegen.py

@@ -707,15 +707,13 @@ class CodeGenerator:
     def visitAssert(self, node):
         # XXX would be interesting to implement this via a
         # transformation of the AST before this stage
+        if __debug__:
             end = self.newBlock()
             self.set_lineno(node)
-        # XXX __debug__ and AssertionError appear to be special cases
-        # -- they are always loaded as globals even if there are local
-        # names.  I guess this is a sort of renaming op.
-        self.emit('LOAD_GLOBAL', '__debug__')
-        self.emit('JUMP_IF_FALSE', end)
+            # XXX AssertionError appears to be special case -- it is always
+            # loaded as a global even if there is a local name.  I guess this
+            # is a sort of renaming op.
             self.nextBlock()
-        self.emit('POP_TOP')
             self.visit(node.test)
             self.emit('JUMP_IF_TRUE', end)
             self.nextBlock()