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diff --git a/tiger-compiler/src/parse/fwd.hh b/tiger-compiler/src/parse/fwd.hh
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+/**
+ ** \file parse/fwd.hh
+ ** \brief Forward declarations for the parse module.
+ */
+
+#pragma once
+
+#include <misc/variant.hh>
+
+// From ast/.
+namespace ast
+{
+  class Exp;
+  class ChunkList;
+
+} // namespace ast
+
+namespace parse
+{
+  // From scantiger.hh.
+  class Lexer;
+
+  // From parsetiger.yy.
+  class parser;
+
+  // From location.hh.
+  class location;
+
+  // From tiger-driver.hh.
+  class TigerDriver;
+
+  // From tweast.hh
+  class Tweast;
+
+  /// Result of a parse: an Exp (*.tig) or a ChunkList (*.tih).
+  using ast_type = misc::variant<ast::Exp*, ast::ChunkList*>;
+
+} // namespace parse