From 431ea5b67e5e360c4b767ce8adba0f38a7ceffac Mon Sep 17 00:00:00 2001
From: electria <elec3137+git@proton.me>
Date: Tue, 21 Jul 2026 14:23:37 -0700
Subject: [PATCH] feat: recognize dedicated minus sign
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> As per Unicode 17.0.0, the ASCII hyphen-minus is not a mathematical symbol. To express the minus sign in math, U+2212 − MINUS SIGN is used instead.

https://en.wikipedia.org/wiki/Mathematical_operators_and_symbols_in_Unicode#cite_ref-7
---
 src/nodes/from_str.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/nodes/from_str.rs b/src/nodes/from_str.rs
index ba94dfa..f07f99f 100644
--- a/src/nodes/from_str.rs
+++ b/src/nodes/from_str.rs
@@ -22,7 +22,7 @@ impl TryFrom<char> for Operator {
     fn try_from(value: char) -> Result<Self, Self::Error> {
         match value {
             '+' => Ok(Self::Plus),
-            '-' => Ok(Self::Minus),
+            '-' | '−' => Ok(Self::Minus),
             '*' | '×' => Ok(Self::Mult),
             '/' | '÷' => Ok(Self::Div),
             '^' => Ok(Self::Exp),