// Clashes with custom_field, struct, enum
checksum decl_name: 16 "crc16"

// Clashes with checksum, struct, enum
custom_field decl_name: 1 "custom"

// Clashes with checksum, custom_field, struct
enum decl_name : 1 {
    A = 1,
}

// Clashes with checksum, custom_field, enum
struct decl_name {
    a: 1,
}

// OK
group decl_name {
    a: 1,
}

// OK
packet decl_name {
    a: 1,
}