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diff --git a/src/expr/expr_stream.h b/src/expr/expr_stream.h
deleted file mode 100644
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--- a/src/expr/expr_stream.h
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@@ -1,45 +0,0 @@
-/*********************                                                        */
-/*! \file expr_stream.h
- ** \verbatim
- ** Top contributors (to current version):
- **   Morgan Deters
- ** This file is part of the CVC4 project.
- ** Copyright (c) 2009-2019 by the authors listed in the file AUTHORS
- ** in the top-level source directory) and their institutional affiliations.
- ** All rights reserved.  See the file COPYING in the top-level source
- ** directory for licensing information.\endverbatim
- **
- ** \brief A stream interface for expressions
- **
- ** A stream interface for expressions.
- **/
-
-#include "cvc4_public.h"
-
-#ifndef CVC4__EXPR_STREAM_H
-#define CVC4__EXPR_STREAM_H
-
-#include "expr/expr.h"
-
-namespace CVC4 {
-
-/**
- * A pure-virtual stream interface for expressions.  Can be used to
- * communicate streams of expressions between different parts of CVC4.
- */
-class CVC4_PUBLIC ExprStream {
-public:
-  /** Virtual destructor; this implementation does nothing. */
-  virtual ~ExprStream() {}
-
-  /**
-   * Get the next expression in the stream (advancing the stream
-   * pointer as a side effect.)
-   */
-  virtual Expr nextExpr() = 0;
-};/* class ExprStream */
-
-}/* CVC4 namespace */
-
-#endif /* CVC4__EXPR_STREAM_H */
-