glaebhoerl

// Based on idea: https://twitter.com/pkhuong/status/1287510400372748290

use hashbrown::raw::RawTable;

pub struct ScopeMap<K, V> {
    last_scope_id: ScopeId,
    scopes:        Vec<ScopeId>, // values are zeroed instead of popped to save a check in get() / is_fresh()
    current_scope: ScopeDepth,   // index of innermost valid scope
    values:        RawTable<Entry<K, V>>,
    shadowed:      Vec<Shadowed<K, V>>,