diff --git a/src/main.rs b/src/main.rs
index c3349d2..dc19a05 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -7,15 +7,14 @@ use std::{
 use tylc as lib;
 
 fn main() -> ExitCode {
-    let input = env::args()
-        .skip(1)
-        .rev()
-        .reduce(|x, a| a + &x)
-        .unwrap_or_else(|| {
+    let input = match env::args().skip(1).rev().reduce(|x, a| a + &x) {
+        Some(s) => s,
+        None => {
             let mut buf = String::new();
             io::stdin().read_to_string(&mut buf).unwrap();
             buf
-        });
+        }
+    };
 
     match lib::formatting::pretty_eval(input, 10) {
         Ok(s) => println!("{s}"),
diff --git a/src/nodes/eval.rs b/src/nodes/eval.rs
index ea06c2b..27d6907 100644
--- a/src/nodes/eval.rs
+++ b/src/nodes/eval.rs
@@ -52,8 +52,6 @@ fn collapse_toplevel(nodes: &mut Vec<Node>, mut end: usize) -> Result<(), Error>
             Node::Number(n) => match variant {
                 Function::Sqrt => n.sqrt_mut(),
 
-                Function::Ln => n.ln_mut(),
-
                 Function::Sine => n.sin_mut(),
                 Function::ArcSine => n.asin_mut(),
                 Function::Cosine => n.cos_mut(),
diff --git a/src/nodes/mod.rs b/src/nodes/mod.rs
index dbc5461..d8e05d9 100644
--- a/src/nodes/mod.rs
+++ b/src/nodes/mod.rs
@@ -76,8 +76,6 @@ pub enum Operator {
 pub enum Function {
     Sqrt,
 
-    Ln,
-
     Sine,
     ArcSine,
     Cosine,
diff --git a/src/nodes/parse.rs b/src/nodes/parse.rs
index 50d0f13..4a20221 100644
--- a/src/nodes/parse.rs
+++ b/src/nodes/parse.rs
@@ -37,8 +37,6 @@ impl FromStr for Function {
         match s {
             "sqrt" => Ok(Self::Sqrt),
 
-            "ln" => Ok(Self::Ln),
-
             "sin" => Ok(Self::Sine),
             "asin" => Ok(Self::ArcSine),
             "cos" => Ok(Self::Cosine),