Switch to the Rust 2024 Edition

Author: kwj

rust/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "euler"
 version = "0.1.0"
-edition = "2021"
+edition = "2024"
 
 [dependencies]
 regex = "1.11.1"

rust/src/bin/p0024.rs

@@ -25,11 +25,7 @@ fn compute(mut idx: usize) -> String {
 }
 
 fn factorial(n: usize) -> usize {
-    if n > 1 {
-        n * factorial(n - 1)
-    } else {
-        1
-    }
+    if n > 1 { n * factorial(n - 1) } else { 1 }
 }
 
 #[cfg(test)]

rust/src/bin/p0050.rs

@@ -22,7 +22,7 @@ fn compute(limit: i64) -> i64 {
             .enumerate()
             .skip(1)
             .rev()
-            .find(|(_, &p)| p - base < limit && primes::is_prime(p - base))
+            .find(|&(_, &p)| p - base < limit && primes::is_prime(p - base))
         {
             k += tpl.0;
             ans = tpl.1 - base;

rust/src/bin/p0092.rs

@@ -93,11 +93,7 @@ fn compute(limit: i64) -> usize {
 }
 
 fn factorial(n: usize) -> usize {
-    if n > 1 {
-        n * factorial(n - 1)
-    } else {
-        1
-    }
+    if n > 1 { n * factorial(n - 1) } else { 1 }
 }
 
 fn is_group89(mut n: i32) -> bool {

rust/src/math.rs

@@ -43,11 +43,7 @@ pub fn lcm(mut x: i64, mut y: i64) -> i64 {
 
 pub fn bit_length(n: i64) -> u32 {
     fn aux(n: i64, cnt: u32) -> u32 {
-        if n == 0 {
-            cnt
-        } else {
-            aux(n / 2, cnt + 1)
-        }
+        if n == 0 { cnt } else { aux(n / 2, cnt + 1) }
     }
 
     aux(n, 0)
@@ -69,14 +65,13 @@ pub fn isqrt(n: i64) -> i64 {
         0
     } else {
         let a = aux((bit_length(n) - 1) / 2, n);
-        if n < a * a {
-            a - 1
-        } else {
-            a
-        }
+        if n < a * a { a - 1 } else { a }
     }
 }
 
+/// # Panics
+///
+/// Will panic if n is less than 2
 pub fn prime_factors(mut n: i64) -> Vec<i64> {
     assert!(n > 1);