You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: adlet.rs
    path of file: ./repos/veloren/world/src/site2/plot
    
    the code of the file until where you have to start completion: use super::*;
use crate::{
    assets::AssetHandle,
    site2::{gen::PrimitiveTransform, util::Dir},
    util::{attempt, sampler::Sampler, FastNoise, RandomField, NEIGHBORS, NEIGHBORS3},
    IndexRef, Land,
};
use common::{
    generation::{ChunkSupplement, EntityInfo},
    terrain::{Structure as PrefabStructure, StructuresGroup},
};
use lazy_static::lazy_static;
use rand::prelude::*;
use std::{
    f32::consts::{PI, TAU},
    sync::Arc,
};
use vek::*;

pub struct AdletStronghold {
    name: String,
    entrance: Vec2<i32>,
    surface_radius: i32,
    // Structure indicates the kind of structure it is, vec2 is relative position of structure
    // compared to wall_center, dir tells which way str
    
    fn required_separation(&self, other: &Self) -> i32 {
        let radius = |structure: &Self| match structure {
            Self::Igloo => 20,
            Self::TunnelEntrance => 32,
            Self::SpeleothemCluster => 4,
            Self::YetiPit => 32,
            Self::Tannery => 6,
            Self::AnimalPen => 8,
            Self::CookFire => 3,
            Self::RockHut => 4,
            Self::BoneHut => 11,
            Self::BossBoneHut => 14,
            Self::Bonfire => 10,
        };

        let additional_padding = match (self, other) {
            (Self::Igloo, Self::Igloo) => 3,
            (Self::BoneHut, Self::BoneHut) => 3,
            (Self::Tannery, Self::Tannery) => 5,
            (Self::CookFire, Self::CookFire) => 20,
            (Self::AnimalPen, Self::AnimalPen) => 8,
            // Keep these last
            (Self::SpeleothemCluster, Self::SpeleothemCluster) => 0,
            (Self::SpeleothemCluster, _) | (_, Self::SpeleothemCluster) => 5,
            _ => 0,
        };

        radius(self) + radius(other) + additional_padding
    }