diff --git a/src/graph.rs b/src/graph.rs
index c0a7fd1..0b53391 100644
--- a/src/graph.rs
+++ b/src/graph.rs
@@ -15,9 +15,6 @@ use core::fmt::Debug;
 #[cfg(not(feature = "no_std"))]
 use std::fmt::Debug;
 
-#[cfg(feature = "no_std")]
-use core::mem;
-
 #[cfg(feature = "no_std")]
 extern crate alloc;
 #[cfg(feature = "no_std")]
@@ -89,8 +86,6 @@ pub struct Graph<T> {
     edge_labels: HashMap<Edge, String>,
 }
 
-const DEFAULT_LABEL: &str = "";
-
 impl<T> Graph<T> {
     /// Creates a new graph.
     ///
diff --git a/src/iterators/bfs.rs b/src/iterators/bfs.rs
index 423ce3b..ffba428 100644
--- a/src/iterators/bfs.rs
+++ b/src/iterators/bfs.rs
@@ -56,8 +56,6 @@ impl<'a, T> Iterator for Bfs<'a, T> {
 
     fn next(&mut self) -> Option<Self::Item> {
         loop {
-            let mut next_ptr = None;
-
             if let Some(current_ptr) = &self.current_ptr {
                 // Yield current pointed value if
                 // it isn't in the visited stack.
@@ -80,7 +78,7 @@ impl<'a, T> Iterator for Bfs<'a, T> {
                 // Move to next root if possible and yield it.
                 if self.queue.is_empty() {
                     if let Some(next_root) = self.roots_stack.pop() {
-                        next_ptr = Some(next_root);
+                        self.current_ptr = Some(next_root);
                     } else {
                         // Break execution if there are no more roots
                         return None;
@@ -88,15 +86,11 @@ impl<'a, T> Iterator for Bfs<'a, T> {
                 } else {
                     // Pop item from queue and set it
                     // as the current pointer.
-                    next_ptr = self.queue.pop_front();
+                    self.current_ptr = self.queue.pop_front();
                 }
             } else {
                 return None;
             }
-
-            if next_ptr.is_some() {
-                self.current_ptr = next_ptr;
-            }
         }
     }
 }
diff --git a/src/iterators/owning_iterator.rs b/src/iterators/owning_iterator.rs
index 34bbcc3..0b40b89 100644
--- a/src/iterators/owning_iterator.rs
+++ b/src/iterators/owning_iterator.rs
@@ -2,12 +2,6 @@
 
 use crate::vertex_id::VertexId;
 
-#[cfg(feature = "no_std")]
-extern crate alloc;
-
-#[cfg(feature = "no_std")]
-use alloc::boxed::Box;
-
 #[cfg(not(feature = "no_std"))]
 use std::fmt::Debug;
 
diff --git a/src/iterators/topo.rs b/src/iterators/topo.rs
index 29a4d00..442c499 100644
--- a/src/iterators/topo.rs
+++ b/src/iterators/topo.rs
@@ -72,7 +72,7 @@ impl<'a, T> Topo<'a, T> {
             }
             None => {
                 if check_cyclic && self.vertices.len() != self.iterable.vertex_count() {
-                    panic!(PANIC_MSG);
+                    panic!("{}", PANIC_MSG);
                 }
                 None
             }
diff --git a/src/lib.rs b/src/lib.rs
index a6c241b..b28a70b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,5 @@
 // Copyright 2019 Octavian Oncescu
 
-#![cfg_attr(feature = "no_std", feature(alloc))]
 #![cfg_attr(feature = "no_std", no_std)]
 
 //! # Graphlib