包含大型源文件的Rust crate初始化Trie结构无法编译（OOM）

Question

I have a Trie structure implemented in Rust which I took from somebody else and seems to work just fine:

pub struct Trie<K, V>
where
    K: std::fmt::Debug + Eq + Hash + Clone,
    V: std::fmt::Debug + Clone,
{
    value: Option<V>,
    children: HashMap<K, Trie<K, V>>,
}

impl<K, V> Trie<K, V>
where
    K: std::fmt::Debug + Eq + Hash + Clone,
    V: std::fmt::Debug + Clone,
{
    pub fn new() -> Trie<K, V> {
        Trie {
            value: None,
            children: HashMap::new(),
        }
    }

    pub fn insert(&mut self, path: Vec<K>, v: V) {
        if path.is_empty() {
            match self.value {
                Some(_) => panic!("key exists"),
                None => {
                    self.value = Some(v);
                }
            }
            return;
        }

        self.children
            .entry(path[0].clone())
            .or_insert(Trie::new())
            .insert(path[1..].to_vec(), v)
    }

    pub fn fetch_or_default(&self, path: Vec<K>, default: V) -> V {
        let value = self.value.clone().unwrap_or(default);
        match path.len() {
            0 => value,
            _ => match self.children.get(&path[0]) {
                Some(child) => child.fetch_or_default(path[1..].to_vec(), value),
                None => value,
            },
        }
    }
}

I have a special file where I initialize an instance of a Trie based on a dictionary containing 150k words, to which I each assign a number between 0 and 150.

The data was generated via JavaScript so it's not like it's impossibly huge, yet for some reason the Rust compile cannot handle it, and crashes out of memory despite my computer having 16Gb of memory + 2Gb swap (that it entirely uses before crashing).

use crate::data::*;

/*
a.reduce((str,ai,i) => { return str + ai.map((w,i) => `    //${w}\n    words_trie.insert(vec![' ',${w.split('').reverse().map(c => `'${c==`'`?`\\`:''}${c}'`).join(',')}], ${i});`).join('\n') + '\n' }, '');
*/

pub fn into(words_trie: &mut Trie<char, usize>) {
    // SPECIAL LINE, DO NO REPLACE BY ABOVE FORMULA
    words_trie.insert(vec![], 150);
    // ================================================
    //'n
    words_trie.insert(vec![' ', 'n', '\''], 0);
    ...
    //(150 000 times a comment followed by an insertion line)
    ...
}

The error message I get is the following one, but that's just the OOM killer at work:

process didn't exit successfully: `rustc --edition=2018 --crate-name postag_nl_v1 src/main.rs --color always --crate-type bin --emit=dep-info,link -C debuginfo=2 -C metadata=f33cf4c96979227f -C extra-filename=-f33cf4c96979227f --out-dir /home/fremy/Documents/postag_nl_v1/target/debug/deps -C incremental=/home/fremy/Documents/postag_nl_v1/target/debug/incremental -L dependency=/home/fremy/Documents/postag_nl_v1/target/debug/deps` (signal: 9, SIGKILL: kill)

How can I get my Trie initialized based on the dictionary without making the compiler crash?

[EDIT] Here is a minimal repro, with dummy data:

https://gist.github.com/FremyCompany/1f6132441338f8b219d961c7254bd8ac#file-main-rs

https://1drv.ms/u/s!AhVrPgyThAkTgQ8v2U99Ffzug7rJ [1Mb zip]