Recursion in struct definitions

[dddejan]

In many syntax examples there are recursive struct definitions where we currently fail with a segmentation fault.

• test/libsolidity/syntaxTests/parsing/mapping_in_struct.sol: mapping value type is the structure containing the mapping

contract test {
    struct test_struct {
        address addr;
        uint256 count;
        mapping(bytes32 => test_struct) self_reference;
    }
}

• test/libsolidity/syntaxTests/parsing/mapping_in_struct.sol: struct contains an array of structs
• test/libsolidity/syntaxTests/structs/recursion/struct_definition_directly_recursive_dynamic_array.sol: same

contract Test {
    struct MyStructName {
        address addr;
        MyStructName[] x;
    }
}

• test/libsolidity/syntaxTests/structs/recursion/struct_definition_indirectly_recursive_dynamic_array1.sol: similar but with indirection
• test/libsolidity/syntaxTests/structs/recursion/struct_definition_indirectly_recursive_dynamic_array2.sol: same
• test/libsolidity/syntaxTests/structs/recursion/struct_definition_indirectly_recursive_dynamic_array3.sol: same

contract Test {
    struct MyStructName1 {
        address addr;
        uint256 count;
        MyStructName2[] x;
    }
    struct MyStructName2 {
        MyStructName1[] x;
    }
}