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diff --git a/src/interactive.h b/src/interactive.h
deleted file mode 100644
index 04c23ae5..00000000
--- a/src/interactive.h
+++ /dev/null
@@ -1,164 +0,0 @@
-/*
- * Copyright (c) 2003-2010, John Wiegley.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- * - Redistributions of source code must retain the above copyright
- *   notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above copyright
- *   notice, this list of conditions and the following disclaimer in the
- *   documentation and/or other materials provided with the distribution.
- *
- * - Neither the name of New Artisans LLC nor the names of its
- *   contributors may be used to endorse or promote products derived from
- *   this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-/**
- * @addtogroup expr
- */
-
-/**
- * @file   interactive.h
- * @author John Wiegley
- *
- * @ingroup expr
- */
-#ifndef _INTERACTIVE_H
-#define _INTERACTIVE_H
-
-#include "scope.h"
-
-namespace ledger {
-
-class interactive_t : public noncopyable
-{
-  call_scope_t& args;
-  string        spec;
-
-public:
-  explicit interactive_t(call_scope_t& _args, const string& _spec = "")
-    : args(_args), spec(_spec)  {
-    TRACE_CTOR(interactive_t, "call_scope_t&, const string&");
-    verify_arguments();
-  }
-  virtual ~interactive_t() {
-    TRACE_DTOR(interactive_t);
-  }
-
-  void verify_arguments() const;
-
-  bool has(std::size_t index) const {
-    if (index < args.size() && ! args[index].is_null())
-      return true;
-    return false;
-  }
-
-  value_t& value_at(std::size_t index) {
-    assert(has(index));
-    return args[index];
-  }
-
-  template <typename T>
-  T get(std::size_t index);
-};
-
-template <>
-inline bool interactive_t::get<bool>(std::size_t index) {
-  return value_at(index).to_boolean();
-}
-template <>
-inline int interactive_t::get<int>(std::size_t index) {
-  return value_at(index).to_int();
-}
-template <>
-inline long interactive_t::get<long>(std::size_t index) {
-  return value_at(index).to_long();
-}
-template <>
-inline amount_t interactive_t::get<amount_t>(std::size_t index) {
-  return value_at(index).to_amount();
-}
-template <>
-inline string interactive_t::get<string>(std::size_t index) {
-  return value_at(index).to_string();
-}
-template <>
-inline mask_t interactive_t::get<mask_t>(std::size_t index) {
-  return value_at(index).to_mask();
-}
-template <>
-inline date_t interactive_t::get<date_t>(std::size_t index) {
-  return value_at(index).to_date();
-}
-template <>
-inline datetime_t interactive_t::get<datetime_t>(std::size_t index) {
-  return value_at(index).to_datetime();
-}
-template <>
-inline value_t::sequence_t&
-interactive_t::get<value_t::sequence_t&>(std::size_t index) {
-  return value_at(index).as_sequence_lval();
-}
-template <>
-inline const value_t::sequence_t&
-interactive_t::get<const value_t::sequence_t&>(std::size_t index) {
-  return value_at(index).as_sequence();
-}
-template <>
-inline scope_t *
-interactive_t::get<scope_t *>(std::size_t index) {
-  return value_at(index).as_scope();
-}
-template <>
-inline expr_t& interactive_t::get<expr_t&>(std::size_t index) {
-  return value_at(index).as_expr_lval();
-}
-template <>
-inline const expr_t& interactive_t::get<const expr_t&>(std::size_t index) {
-  return value_at(index).as_expr();
-}
-
-template <typename T>
-class in_context_t : public interactive_t
-{
-  T& context;
-
-public:
-  explicit in_context_t(call_scope_t& args, const string& spec)
-    : interactive_t(args, spec), context(find_scope<T>(args)) {
-    TRACE_CTOR(in_context_t, "call_scope_t&, const string&");
-  }
-  virtual ~in_context_t() {
-    TRACE_DTOR(in_context_t);
-  }
-
-  T& operator *() {
-    return context;
-  }
-  T * operator->() {
-    return &context;
-  }
-};
-
-string join_args(call_scope_t& args);
-
-} // namespace ledger
-
-#endif // _INTERACTIVE_H
-