Comment #23 on issue 1924 by matt...@gmail.com: Eq() gets .as_basic() method http://code.google.com/p/sympy/issues/detail?id=1924
as_expr() doesn't make sense as noted above since Eq is already an Expr.
Poly is an Expr, but it has as_expr() method. Almost everything is an Expr but there is difference between being an instance of Expr and being a basic expression (expr).
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