diff --git a/src/assembler.rs b/src/assembler.rs
index 22aef2f..28e3170 100644
--- a/src/assembler.rs
+++ b/src/assembler.rs
@@ -3,7 +3,7 @@
 use error::{AResult, ErrorKind::*};
 use std::collections::HashMap;
 
-use crate::{assembler::canonical::Canonicalize, lexer::token, parser::ast::*, util::Span};
+use crate::{assembler::canonical::Canonicalize, lexer::token, parser::ast::*, span::Span};
 
 use self::error::{Error, ErrorKind};
 
@@ -366,7 +366,7 @@ impl<'t> Assembler<'t> {
 pub mod error {
     use std::fmt::Display;
 
-    use crate::util::Span;
+    use crate::span::Span;
 
     pub type AResult<T> = Result<T, Error>;
 
diff --git a/src/lexer.rs b/src/lexer.rs
index c2a8edc..a4c1290 100644
--- a/src/lexer.rs
+++ b/src/lexer.rs
@@ -5,7 +5,7 @@
 pub mod token;
 
 use self::token::{Special, TokenKind, *};
-use crate::util::Span;
+use crate::span::Span;
 use std::{
     iter::Peekable,
     str::{CharIndices, FromStr},
diff --git a/src/lexer/token.rs b/src/lexer/token.rs
index a467f68..119afb6 100644
--- a/src/lexer/token.rs
+++ b/src/lexer/token.rs
@@ -2,7 +2,7 @@
 //! A [Token] is a [semantically-tagged](TokenKind) [sequence of characters](str) and a [Span]
 //!
 //! [Tokens](Token) are a borrowed, and cannot outlive their source slice (lifetime `'t`)
-use crate::util::Span;
+use crate::span::Span;
 #[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct Token<'t> {
     pub lexeme: &'t str,
diff --git a/src/lib.rs b/src/lib.rs
index 63a4e5a..615d18f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -54,50 +54,7 @@
 //!    └─ EndOfFile
 //! ```
 
-pub mod util {
-    use std::{
-        fmt::{Debug, Display},
-        ops::{Index, Range},
-    };
-    /// A <code> [Clone] + [Copy] + [!Iterator](Iterator) <\code> version of a [Range]
-    #[derive(Clone, Copy, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
-    pub struct Span<Idx> {
-        pub start: Idx,
-        pub end: Idx,
-    }
-    impl<Idx> From<Span<Idx>> for Range<Idx> {
-        fn from(value: Span<Idx>) -> Self {
-            value.start..value.end
-        }
-    }
-    impl<Idx> From<Range<Idx>> for Span<Idx> {
-        fn from(value: Range<Idx>) -> Self {
-            Self { start: value.start, end: value.end }
-        }
-    }
-    impl<T> Index<Span<usize>> for [T] {
-        type Output = [T];
-        fn index(&self, index: Span<usize>) -> &Self::Output {
-            self.index(Range::from(index))
-        }
-    }
-    impl Index<Span<usize>> for str {
-        type Output = str;
-        fn index(&self, index: Span<usize>) -> &Self::Output {
-            self.index(Range::from(index))
-        }
-    }
-    impl<Idx: Debug> Debug for Span<Idx> {
-        fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-            write!(f, "{:?}..{:?}", self.start, self.end)
-        }
-    }
-    impl<Idx: Display> Display for Span<Idx> {
-        fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-            write!(f, "{}..{}", self.start, self.end)
-        }
-    }
-}
+pub mod span;
 
 pub mod lexer;
 
diff --git a/src/parser.rs b/src/parser.rs
index e9c5643..451487e 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -13,7 +13,7 @@ use crate::{
         Lexer,
     },
     preprocessor::Preprocessor,
-    util::Span,
+    span::Span,
 };
 use ast::*;
 
@@ -497,7 +497,7 @@ impl<'t> Parser<'t> {
 
 pub mod error {
     use super::Kind;
-    use crate::util::Span;
+    use crate::span::Span;
     use std::{fmt::Display, num::TryFromIntError};
 
     pub type PResult<T> = Result<T, Error>;
diff --git a/src/parser/ast.rs b/src/parser/ast.rs
index a798dd1..8337bb5 100644
--- a/src/parser/ast.rs
+++ b/src/parser/ast.rs
@@ -2,7 +2,7 @@
 /// Represents MSP430 instructions,
 use crate::{
     lexer::token::{self, Reg, Token},
-    util::Span,
+    span::Span,
 };
 
 #[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
diff --git a/src/preprocessor.rs b/src/preprocessor.rs
index fd624b9..9df3bfe 100644
--- a/src/preprocessor.rs
+++ b/src/preprocessor.rs
@@ -5,7 +5,7 @@ use crate::{
         token::{Token, TokenKind as Kind},
         Lexer,
     },
-    util::Span,
+    span::Span,
 };
 use std::collections::{HashMap, VecDeque};
 
diff --git a/src/span.rs b/src/span.rs
new file mode 100644
index 0000000..4ca993b
--- /dev/null
+++ b/src/span.rs
@@ -0,0 +1,43 @@
+//! A [Span] is a [Range] that does not implement [Iterator]. It is a [Copy] type.
+use std::{
+    fmt::{Debug, Display},
+    ops::{Index, Range},
+};
+/// A <code> [Clone] + [Copy] + [!Iterator](Iterator) </code> version of a [Range]
+#[derive(Clone, Copy, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct Span<Idx> {
+    pub start: Idx,
+    pub end: Idx,
+}
+impl<Idx> From<Span<Idx>> for Range<Idx> {
+    fn from(value: Span<Idx>) -> Self {
+        value.start..value.end
+    }
+}
+impl<Idx> From<Range<Idx>> for Span<Idx> {
+    fn from(value: Range<Idx>) -> Self {
+        Self { start: value.start, end: value.end }
+    }
+}
+impl<T> Index<Span<usize>> for [T] {
+    type Output = [T];
+    fn index(&self, index: Span<usize>) -> &Self::Output {
+        self.index(Range::from(index))
+    }
+}
+impl Index<Span<usize>> for str {
+    type Output = str;
+    fn index(&self, index: Span<usize>) -> &Self::Output {
+        self.index(Range::from(index))
+    }
+}
+impl<Idx: Debug> Debug for Span<Idx> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{:?}..{:?}", self.start, self.end)
+    }
+}
+impl<Idx: Display> Display for Span<Idx> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}..{}", self.start, self.end)
+    }
+}