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diff --git a/tiger-compiler/src/ast/tasks.hh b/tiger-compiler/src/ast/tasks.hh
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+/**
+ ** \file ast/tasks.hh
+ ** \brief Ast module related tasks.
+ */
+
+#pragma once
+
+#include <ast/chunk-list.hh>
+#include <task/libtask.hh>
+
+namespace ast::tasks
+{
+  /// Global root node of abstract syntax tree.
+  extern std::unique_ptr<ast::ChunkList> the_program;
+
+  TASK_GROUP("2. Abstract Syntax Tree");
+
+  /// Display the abstract syntax tree.
+  TASK_DECLARE("A|ast-display", "display the AST", ast_display, "parse");
+
+  /// Display the abstract syntax tree using a dumper.
+  TASK_DECLARE("ast-dump", "dump the AST", ast_dump, "parse");
+
+} // namespace ast::tasks