From 284facad24cc64fa00d5b7d5f1cec8d1732183fa Mon Sep 17 00:00:00 2001
From: Freya Murphy <freya@freyacat.org>
Date: Tue, 11 Nov 2025 19:58:01 -0500
Subject: dungeon: downcast! -> try_from!

---
 dungeon/src/pos.rs | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/dungeon/src/pos.rs b/dungeon/src/pos.rs
index 47732a0..b7a977c 100644
--- a/dungeon/src/pos.rs
+++ b/dungeon/src/pos.rs
@@ -17,7 +17,9 @@ use std::{
 
 use crate::{MAP_SIZE_USIZE, map::MAP_SIZE};
 
-macro_rules! downcast {
+/// This allows us have a u16::try_from(usize)
+/// like expr in a const context
+macro_rules! try_from {
 	($usize:expr, $type:ty) => {
 		if $usize > <$type>::MAX as usize {
 			None
@@ -233,8 +235,8 @@ impl Pos {
 	/// ```
 	#[must_use]
 	pub const fn from_idx(idx: usize) -> Option<Self> {
-		let x = downcast!(idx % MAP_SIZE_USIZE, u16);
-		let y = downcast!(idx / MAP_SIZE_USIZE, u16);
+		let x = try_from!(idx % MAP_SIZE_USIZE, u16);
+		let y = try_from!(idx / MAP_SIZE_USIZE, u16);
 		match (x, y) {
 			(Some(a), Some(b)) => Self::new(a, b),
 			_ => None,
-- 
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