diff --git a/Cargo.lock b/Cargo.lock
index eff8c27..32005b6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -15,6 +15,7 @@ dependencies = [
 name = "aoc"
 version = "0.1.0"
 dependencies = [
+ "enum-map",
  "num-traits",
  "strum 0.24.1",
  "thiserror",
diff --git a/common/rust/Cargo.toml b/common/rust/Cargo.toml
index ebe2750..96f2fee 100644
--- a/common/rust/Cargo.toml
+++ b/common/rust/Cargo.toml
@@ -6,6 +6,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+enum-map = "2.7.3"
 num-traits = "0.2.15"
 strum = { version = "0.24.1", features = ["derive"] }
 thiserror = "1.0.38"
diff --git a/common/rust/src/vec2.rs b/common/rust/src/vec2.rs
index f54c714..3f12bc4 100644
--- a/common/rust/src/vec2.rs
+++ b/common/rust/src/vec2.rs
@@ -4,6 +4,8 @@ use std::{
     str::FromStr,
 };
 
+use enum_map::Enum;
+
 #[derive(Debug, Default, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct Vec2 {
     pub x: i32, // increases toward right
@@ -169,7 +171,7 @@ impl From<Direction> for Vec2 {
     }
 }
 
-#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Enum)]
 pub enum Direction {
     Up,
     Down,