+typedef struct expression_base_t expression_base_t;
+typedef struct literal_expression_t literal_expression_t;
+typedef struct string_literal_expression_t string_literal_expression_t;
+typedef struct funcname_expression_t funcname_expression_t;
+typedef struct compound_literal_expression_t compound_literal_expression_t;
+typedef struct reference_expression_t reference_expression_t;
+typedef struct call_argument_t call_argument_t;
+typedef struct call_expression_t call_expression_t;
+typedef struct binary_expression_t binary_expression_t;
+typedef struct unary_expression_t unary_expression_t;
+typedef struct select_expression_t select_expression_t;
+typedef struct array_access_expression_t array_access_expression_t;
+typedef struct typeprop_expression_t typeprop_expression_t;
+typedef struct conditional_expression_t conditional_expression_t;
+typedef struct statement_expression_t statement_expression_t;
+typedef struct designator_t designator_t;
+typedef struct offsetof_expression_t offsetof_expression_t;
+typedef struct va_start_expression_t va_start_expression_t;
+typedef struct va_arg_expression_t va_arg_expression_t;
+typedef struct va_copy_expression_t va_copy_expression_t;
+typedef struct builtin_constant_expression_t builtin_constant_expression_t;
+typedef struct builtin_types_compatible_expression_t builtin_types_compatible_expression_t;
+typedef struct classify_type_expression_t classify_type_expression_t;
+typedef struct label_address_expression_t label_address_expression_t;
+typedef union expression_t expression_t;