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diff --git a/tiger-compiler/src/ast/libast.hh b/tiger-compiler/src/ast/libast.hh
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+++ b/tiger-compiler/src/ast/libast.hh
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+/**
+ ** \file ast/libast.hh
+ ** \brief Public ast interface declaration.
+ */
+
+#pragma once
+
+#include <iosfwd>
+
+#include <misc/xalloc.hh>
+
+#include <ast/fwd.hh>
+
+/// Ast management.
+namespace ast
+{
+  extern const misc::xalloc<bool> escapes_display;
+  extern const misc::xalloc<bool> bindings_display;
+
+  /// Output \a a on \a ostr.
+  std::ostream& operator<<(std::ostream& ostr, const Ast& tree);
+
+  /// Dump \a a on \a ostr.
+  std::ostream& dump_dot(const Ast& tree, std::ostream& ostr);
+
+} // namespace ast