typedef struct compound_statement_t compound_statement_t;
typedef struct return_statement_t return_statement_t;
typedef struct if_statement_t if_statement_t;
typedef struct switch_statement_t switch_statement_t;
typedef struct declaration_statement_t declaration_statement_t;
typedef struct compound_statement_t compound_statement_t;
typedef struct return_statement_t return_statement_t;
typedef struct if_statement_t if_statement_t;
typedef struct switch_statement_t switch_statement_t;
typedef struct declaration_statement_t declaration_statement_t;