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/usr/include/isl/id_to_ast_expr.h is in libisl-dev 0.19-1.

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#ifndef ISL_ID_TO_AST_EXPR_H
#define ISL_ID_TO_AST_EXPR_H

#include <isl/id.h>
#include <isl/ast_type.h>
#include <isl/maybe_ast_expr.h>

#define ISL_KEY		isl_id
#define ISL_VAL		isl_ast_expr
#define ISL_HMAP_SUFFIX	id_to_ast_expr
#define ISL_HMAP	isl_id_to_ast_expr
#include <isl/hmap.h>
#undef ISL_KEY
#undef ISL_VAL
#undef ISL_HMAP_SUFFIX
#undef ISL_HMAP

#endif